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In the politics of the United States, the process of initiatives and referendums allow citizens of many U.S. states[1] to place legislation on the ballot for a referendum or popular vote, either enacting new legislation, or voting down existing legislation. Citizens, or an organization, might start a popular initiative to gather a predetermined number of signatures to qualify the measure for the ballot. The measure is placed on the ballot for the referendum, or actual vote.
Initiatives and referendums, along with recall elections and popular primary elections, were signature reforms from the Progressive Era (1896–1917) when people sought to moderate the power of parties and political bosses. These powers are written into several state constitutions, particularly in the West. Initiatives and referendums constitute a form of direct democracy. As of 2024, these processes are only available at state levels, and do not exist for federal legislation.
The technical name of these types of votes used internationally is referendum, but within the United States they are commonly known as ballot measures, propositions or ballot questions. The term referendum in the United States normally refers specifically to questions about striking down enacted law, known internationally as the popular referendum.
History
The Progressive Era was a period marked by reforms aimed at breaking the concentrated power, or monopoly, of certain corporations and trusts. Many Progressives believed that state legislatures were part of this problem and that they were essentially "in the pocket" of certain wealthy interests. They sought a method to counter this—a way in which average persons could become directly involved in the political process. One of the methods they came up with was the initiative and referendum. Through 2006, 2,231 statewide initiatives were held in the United States, of which 887 were successful.[2]
Because US states with direct democracy require each signature to be witnessed and notarized by a circulator, gathering the required signatures usually costs millions of dollars in the larger states, to hire circulators. This means that the process, as with state legislatures described above, is also "in the pocket" of certain wealthy interests.
In 2021, in Boulder, Colorado, the first official online petition system was used to get an initiative on the ballot, with no circulators involved at petitions.bouldercolorado.gov.
The voters of the city of Boulder approved a charter amendment allowing online petitioning by a vote of 71% to 29% in 2018.[3] The proposal was developed by members of the city's Campaign Finance and Elections Working Group, spearheaded by Evan Ravitz and Steve Pomerance.
Types of initiatives and referendums
![](Https://upload.wikimedia.org/wikipedia/commons/thumb/f/fa/Initiatives%2C_referendums%2C_and_legislative_referral_in_the_United_States.svg/500px-Initiatives%2C_referendums%2C_and_legislative_referral_in_the_United_States.svg.png)
1Mississippi technically would allow indirect initiated constitutional amendments, but this process is currently obsolete.
Initiatives and referendums—collectively known as "ballot measures", "propositions", or simply "questions"—differ from most legislation passed by representative democracies; ordinarily, an elected legislative body develops and passes laws. Initiatives and referendums, by contrast, allow citizens to vote directly on legislation.
In many U.S. states, ballot measures may originate by several different processes:[4] Overall, 26 US states have initiative and/or veto referendum processes at the statewide level, and all states have at least one form of legislatively referred processes: 49 states have at least a legislatively referred process to amend their constitutions, and one state, Delaware, has a possibility of legislatively referred ballot measures to pass new statutes only. In all of these states except Delaware, to modify the state constitution, at least one form of ballot measure is mandatory, under sometimes greatly different processes from state to state, either for directly voting on a proposed modification, or voting on a ballot measure for choosing to call or not for the election of a state convention charged of modifying the state constitution. Washington, D.C., also has initiative and veto referendum processes. Additionally, multiple forms of direct democracy also exists at the local level, including in some states that otherwise do not have these forms of direct democracy at the state level, the availability of direct democracy measures at the local level varying by jurisdiction depending on state and local laws.[5]
Initiatives
An initiative is a means through which any citizen or organization may gather a predetermined number of signatures to qualify a measure to be placed on a ballot, and to be voted upon in a future election (These may be further divided into constitutional amendments and statutory initiatives. Statutory initiatives typically require fewer signatures to qualify to be placed on a future ballot.).
Initiatives can also be indirect, which means that after sufficient signatures to place a measure on the ballot are collected, the measure is first considered by a state or local legislative body. If the legislative body elects not to pass the proposed new law within a prescribed window of opportunity, the initiative must then be placed on the ballot. The details of the process vary by state. For example, in some states, another round of signatures is required to qualify an initiative for the ballot if the legislature does not approve it. In others, if the legislature passes a law determined to be substantially similar to the initiative, it precludes an election on the original initiative proposal, while in others the legislature must pass the initiative unaltered or it goes to the voters.[6]
Initiated state constitutional amendment
An initiated constitutional amendment is an amendment to a state's constitution that results from petitioning by a state's citizens. By utilizing this initiative process, citizens can propose and vote on constitutional amendments directly, without need of legislative referral. When a sufficient number of citizens have signed a petition requesting it, a proposed constitutional amendment is then put to the vote.
In the United States, while no court or legislature needs to approve a proposal or the resultant initiated constitutional amendment, such amendments may be overturned if they are challenged and a court confirms that they are unconstitutional.[citation needed] Most states that permit the process require a 2/3 majority vote.[citation needed]
Not all amendments proposed will receive sufficient support to be placed on the ballot. Of the 26 proposed petitions filed in the state of Florida in its 1994 general election, only three garnered sufficient support to be put to the vote.[7]
Indirect initiated state constitutional amendment
The initiative process, for proposing constitutional amendments, may also, like for state statutes, be "direct" or "indirect". Among the 18 states that provide for citizen-initiated constitutional amendments, Massachusetts and Mississippi are the only two states with indirect initiated state constitutional amendment.
In Massachusetts, if enough signatures are submitted for an initiated constitutional amendment, the initiative first goes to the legislature where it must garner approval in two successive legislative sessions from one-quarter of state senators and representatives voting together in a joint session. Massachusetts is the only state to have such a requirement for initiated constitutional amendments.[8]
Before 2021 in Mississippi, if enough signatures were collected and submitted, the legislature had to either: approve the measure; ignore the measure (but it does not annul the measure, it still goes to the ballot); voting against the measure without providing for an alternative (but it does not annul the measure, it still goes to the ballot); or approve an alternative amendment to appear on the ballot alongside the original citizen proposal as a competing measure. In the cases when both of the contradicting measures were approved by voters, the measure with the most votes was the one that became law.[9]
A May 2021 decision by the Mississippi Supreme Court nullified a voter-passed initiative that permitted medical marijuana in the state, with the 6–3 majority citing a fundamental flaw in the state's constitutional process that was viewed by media as effectively banning future use of indirect initiatives in the amendment process, barring a future constitutional amendment. The indirect initiative process, added to the state's constitution in the 1990s as Article 15, Section 273(3), requires that over a 1-year period, the sponsors obtain a total number of signatures equal to at least 12% of the total number of votes cast for governor in the state's last election for that office. Additionally, it requires that no more than 20% of the signatures required to place an initiative on the ballot come from any single congressional (i.e., U.S. House) district. At the time the indirect initiative process passed, Mississippi had five congressional districts, but the state lost one House seat in the reapportionment that followed the 2000 United States Census. In the majority decision, Justice Josiah Coleman wrote, "Whether with intent, by oversight, or for some other reason, the drafters of section 273(3) wrote a ballot-initiative process that cannot work in a world where Mississippi has fewer than five representatives in Congress. To work in today's reality, it will need amending—something that lies beyond the power of the Supreme Court." Coleman added that from 2003 to 2015, the legislature had attempted six times to place an amendment on the ballot that would have changed the process to reflect Mississippi's current (and presumably future) House apportionment, but all attempts died in committee.[10][11]
Referendum
Called Popular referendum, or alternatively Veto Referendum, Citizen referendum, Statute referendum, Statute remand, People's veto, or Citizen's veto, in which a predetermined number of signatures (typically lower than the number required for an initiative) qualifies a ballot measure for voting on repealing or not a specific state law. 23 states allow for citizens to initiate popular referendums, and one territory, the U.S. Virgin Islands. The popular referendum was first introduced in the United States by South Dakota in 1898,[12] and first used in 1906 in Oregon, two years after the first initiative was used in 1904, also in Oregon.[13]
Legislative referral
Legislative referral (aka "legislative referendum", or "referendum bill" in the state of Washington for legislatively referred state statute), in which the legislature puts proposed legislation up for popular vote (either voluntarily or, in the case of a constitutional amendment, as an obligatory part of the procedure).[14] With the exception of Delaware, 49 US states allow legislatively referred state constitutional amendments.[15]
Statute affirmation
Nevada is the only state to allow for statute affirmation. The statute affirmation allows the voters to collect signatures to place on ballot a question asking the state citizens to affirm a standing state law. If a majority of state citizens vote to affirm the law, the state legislature will be barred from ever amending the law, and it can be amended or repealed only if approved by a majority of state citizens in a direct vote.[16]
Automatic referrals
An automatic referral is question that is legally required to automatically be placed on the ballot. Many states have laws in their constitution requiring a question to hold a constitutional convention to appear before the voters after a scheduled amount of time.
Agricultural referendums
The United States code requires national referendums before the authorization of marketing quotas for certain agricultural products including wheat, maize, milk, and rice. The responsibility of conducting these referendums is with the Secretary of Agriculture, and eligibility to vote is limited to producers of the agricultural product in question.[17][18]
A similar referendum system is in place for fishing quotas in both the New England and Gulf fishery management councils.[19]
Referendum law by state
State or territory |
Statute initiative |
Constitutional initiative |
Referendum | Legislative referral | Statute affirmation | |
---|---|---|---|---|---|---|
Statute | Amendment | |||||
Alabama | None | None | No | No | Yes | No |
Alaska | Indirect | None | Yes | No | Yes | No |
Arizona | Direct | Direct | Yes | Yes | Yes | No |
Arkansas | Direct | Direct | Yes | Yes | Yes | No |
California | Direct | Direct | Yes | Yes | Yes | No |
Colorado | Direct | Direct | Yes | Yes | Yes | No |
Connecticut | None | None | No | No | Yes | No |
Delaware | None | None | No | Yes | No | No |
District of Columbia | Direct | None* | Yes | No | Yes* | No |
Florida | None | Direct | No | No | Yes | No |
Georgia | None | None | No | No | Yes | No |
Hawaii | None | None | No | No | Yes | No |
Idaho | Direct | None | Yes | No | Yes | No |
Illinois | None | Direct | No | Yes | Yes | No |
Indiana | None | None | No | No | Yes | No |
Iowa | None | None | No | No | Yes | No |
Kansas | None | None | No | No | Yes | No |
Kentucky | None | None | No | Yes | Yes | No |
Louisiana | None | None | No | No | Yes | No |
Maine | Indirect | None | Yes | Yes | Yes | No |
Maryland | None | None | Yes | Yes | Yes | No |
Massachusetts | Indirect | Indirect | Yes | Yes | Yes | No |
Michigan | Indirect | Direct | Yes | Yes | Yes | No |
Minnesota | None | None | No | No | Yes | No |
Mississippi | None | Obsolete** | No | No | Yes | No |
Missouri | Direct | Direct | Yes | Yes | Yes | No |
Montana | Direct | Direct | Yes | Yes | Yes | No |
Nebraska | Direct | Direct | Yes | Yes | Yes | No |
Nevada | Indirect | Direct | Yes | Yes | Yes | Yes |
New Hampshire | None | None | No | No | Yes | No |
New Jersey | None | None | No | No | Yes | No |
New Mexico | None | None | Yes | Yes | Yes | No |
New York | None | None | No | No | Yes | No |
North Carolina | None | None | No | No | Yes | No |
North Dakota | Direct | Direct | Yes | Yes | Yes | No |
Ohio | Indirect | Direct | Yes | Yes | Yes | No |
Oklahoma | Direct | Direct | Yes | Yes | Yes | No |
Oregon | Direct | Direct | Yes | Yes | Yes | No |
Pennsylvania | None | None | No | No | Yes | No |
Rhode Island | None | None | No | No | Yes | No |
South Carolina | None | None | No | No | Yes | No |
South Dakota | Direct | Direct | Yes | Yes | Yes | No |
Tennessee | None | None | No | No | Yes | No |
Texas | None | None | No | No | Yes | No |
Utah | Both | None | Yes | Yes | Yes | No |
Vermont | None | None | No | No | Yes | No |
Virginia | None | None | No | No | Yes | No |
Washington | Both | None | Yes | Yes | Yes | No |
West Virginia | None | None | No | No | Yes | No |
Wisconsin | None | None | No | No | Yes | No |
Wyoming | Indirect | None | Yes | No | Yes | No |
State or territory |
Statute or initiative |
Constitutional initiative |
Referendum | Statute | Amendment | Statute affirmation |
Legislative referral |
*The District of Columbia does not have a Constitution, however it does have a Charter which can be amended by Referral to the Ballot by the City Council followed by Congressional approval
**Citizen Initiated Amendments in Mississippi cannot qualify for the ballot so long as the state has four Congressional Districts due to a signature distribution provision requiring votes from five Congressional Districts[20]
Objections to the system
The initiative and referendums process have critics. Some argue that initiatives and referendums undermine representative government by circumventing the elected representatives of the people and allowing the people to directly make policy: they fear excessive majoritarianism (tyranny of the majority) as a result, believing that minority groups may be harmed.[21][22][23]
Other criticisms are that competing initiatives with conflicting provisions can create legal difficulties when both pass;[24] and that when the initiatives are proposed before the end of the legislative session, the legislature can make statutory changes that weaken the case for passing the initiative.[25] Yet another criticism is that as the number of required signatures has risen in tandem with populations, "initiatives have moved away from empowering the average citizen" and toward becoming a tool for well-heeled special interests to advance their agendas.[26] John Diaz wrote in an editorial for the San Francisco Chronicle in 2008:[27]
There is no big secret to the formula for manipulating California's initiative process. Find a billionaire benefactor with the ideological motivation or crass self-interest to spend the $1-million plus to get something on the ballot with mercenary signature gatherers. Stretch as far as required to link it to the issue of the ages (this is for the children, Prop. 3) or the cause of the day (this is about energy independence and renewable resources, Props. 7 and 10). If it's a tough sell on the facts, give it a sympathetic face and name such as "Marsy's Law" (Prop. 9, victims' rights and parole) or "Sarah's Law" (Prop. 4, parental notification on abortion). Prepare to spend a bundle on soft-focus television advertising and hope voters don't notice the fine print or the independent analyses of good-government groups or newspaper editorial boards ... Today, the initiative process is no longer the antidote to special interests and the moneyed class; it is their vehicle of choice to attempt to get their way without having to endure the scrutiny and compromise of the legislative process.
In some cases, voters have passed initiatives that were subsequently repealed or drastically changed by the legislature. For instance, legislation passed by the voters as an Arizonan medical cannabis initiative was subsequently gutted by the Arizona legislature.[28] To prevent such occurrences, initiatives are sometimes used to amend the state constitution and thus prevent the legislature from changing it without sending a referendum to the voters; however, this produces the problems of inflexibility mentioned above. Accordingly, some states are seeking a middle route. For example, Colorado's Referendum O would require a two-thirds vote for the legislature to change statutes passed by the voters through initiatives, until five years after such passage. This would allow the legislature to easily make uncontroversial changes.[29]
An objection not so much to the initial concept, but to its present implementations, is that signature challenges are becoming a political tool, with state officials and opposing groups litigating the process, rather than simply taking the issue fight to voters.[30] Signatures can be declared void based on technical omissions, and initiatives can be thrown out based on statistical samplings of signatures. Supporters lacking necessary funds to sustain legal battles can find their initiative taken off the ballot.
![](Https://upload.wikimedia.org/wikipedia/commons/thumb/b/be/MedicaidForIdahoVan.jpg/120px-MedicaidForIdahoVan.jpg)
Legislatures themselves may tighten already arduous requirements. E.g., while California or Oregon typically have dozens of ballot measures each year, Idaho has had 28 since the 1930s, of which twelve passed. The Idaho Legislature in 2013 however increased the geographical requirements for putting an initiative on the ballot[31] after a trio of unpopular education laws ("Students Come First") were repealed by the voters. Despite the new requirement of the signatures of 6% of the registered voters in 18 of Idaho's 35 legislative districts before May,[32] as of mid-April 2018 the drive to put the Medicaid gap before the voters on the November ballot (by way of their amending the state constitution, yea or nay)[33] was well on its way to gathering the prerequisite number of signatures in the prerequisite number of legislative districts, much to the surprise of pundits.[34] Ultimately the organizers had by the April 30 deadline delivered 60,000 signatures to county clerks' offices, which if verified are far more than the 56,192 required.[35]
The New York Times reported in May 2021 that so far that year, Republicans had introduced 144 bills to restrict initiatives in 32 states, 19 of which had been signed into law by nine Republican governors. Although initiatives had historically been used by both parties, Democrats had been especially successful using the process in recent years in states where they do not control the state government. In three states, Republican legislators asked voters to approve initiatives that would restrict their right to bring and pass future initiatives.[36]
Proposed reforms
Some proposed reforms include paying signature gatherers by the hour, rather than by the signature (to reduce incentives for fraud) and increasing transparency by requiring major financial backers of initiatives to be disclosed to potential signatories. Other proposals include having a "cooling-off" period after an initiative qualifies, in which the legislature can make the initiative unnecessary by passing legislation acceptable to the initiative's sponsors.[37] It has also been proposed that proxy voting be combined with initiative and referendum to form a hybrid of direct democracy and representative democracy.[38]
Ludlow Amendment
The Ludlow Amendment was a proposed constitutional amendment drafted by Indiana congressman Louis Ludlow allowing for a referendum after a congressional declaration of war. It reached its peak public approval rating in the 1930s in an effort to maintain American isolationism in the years before the Second World War.
National initiative
The national initiative is a proposal to amend the United States Constitution to allow ballot initiatives at the federal level.
Citizens' Initiative Review
Healthy Democracy, and a similar organization in Washington State, proposed a Citizens' Initiative Review process. This brings together a representative cross-section of voters as a citizens' jury to question and hear from advocates and experts regarding a ballot measure; then deliberate and reflect together to come up with statements that support and/or oppose the measure. The state would organize such a review of each ballot measure, and include the panelists' statements in the voters' pamphlet. Since 2009, Healthy Democracy has led efforts to develop and refine the Citizens' Initiative Review process for use by Oregon voters.
In 2011, the Oregon Legislature approved House Bill 2634, legislation making the Citizens' Initiative Review a permanent part of Oregon elections.[39] This marked the first time a legislature has made voter deliberation a formalized part of the election process. The CIR is a benchmark in the initiative reform and public engagement fields.
Each state has individual requirements to qualify initiatives for the ballot. Generally, all 24 states and the District of Columbia follow steps similar to:
- File a proposed petition with a designated state official
- State review of the proposal and, in several states, a review of the language of the proposal
- Prepare ballot title and summary
- Petition circulation to obtain the required number of signatures
- Petition submitted to state election officials to verify the signatures and qualify the ballot entry
See also
- Comparison of U.S. state governments
- Hollingsworth v. Perry
- Fairness Project
- Elections in Puerto Rico
- Meyer v. Grant
References
- ^ "State by state listing of where they are used". Iandrinstitute.org. Archived from the original on 2016-02-11. Retrieved 2010-06-17.
- ^ Gilbert, Michael D. (2008). Law, Politics, and Preferences: An Economic Analysis of Direct Democracy and the Single Subject Rule. University of California, Berkeley. p. 13.
- ^ "Boulder County 2018 General Election Results".
- ^ "What is I&R?". Iandrinstitute.org. Archived from the original on 2010-07-25. Retrieved 2010-06-17.
- ^ "States with initiative or referendum - Ballotpedia".
- ^ Gray, Virginia & Russell L. Hanson. Politics in the American States. 9 ed. Washington, DC: CQ Press, 2008. p. 141.
- ^ Jameson, P.K. and Marsha Hosack. (1996) "Citizen Initiative in Florida: An Analysis of Florida's Constitutional Initiative Process, Issues, and Statutory Initiative Alternatives Archived 2012-03-02 at the Wayback Machine." pp. 1-2. Originally published in Florida State University Law Review 23:417.
- ^ Gray, Virginia & Russell L. Hanson. Politics in the American States. 9 ed. Washington, DC: CQ Press, 2008. p. 141.
- ^ "Constitutional Initiative in Mississippi: A Citizen's Guide" (PDF). Secretary of State, Mississippi. 2009-01-14. p. 2. Retrieved 2010-04-29.
- ^ Gregorian, Dareh (May 14, 2021). "Mississippi Supreme Court overturns voter-approved medical marijuana initiative". NBC News. Retrieved May 15, 2021.
- ^ "In Re Initiative Measure No. 65" (PDF). Supreme Court of Mississippi. May 14, 2021. Retrieved May 15, 2021.
- ^ Arthur N. Holcombe, State Government in the United States, Read Books, 2007, ISBN 1-4067-7154-6, Google Print, p.141
- ^ Arthur N. Holcombe, State Government in the United States, Read Books, 2007, ISBN 1-4067-7154-6, Google Print, p.529
- ^ "Legislatively referred state statute". Ballotpedia. Retrieved 23 July 2021.
- ^ "Legislatively referred constitutional amendment". Ballotpedia. Retrieved 23 July 2021.
- ^ "Statute affirmation". Ballotpedia. Retrieved 23 July 2021.
- ^ Howard, L. V. (1942). "The Agricultural Referendum". Public Administration Review. 2 (1): 9–26. doi:10.2307/973041. ISSN 0033-3352. JSTOR 973041.
- ^ Martin, Robert E. (1951). "The Referendum Process in the Agricultural Adjustment Programs of the United States". Agricultural History. 25 (1): 34–47. ISSN 0002-1482. JSTOR 3740296.
- ^ "New England and Gulf of Mexico Individual Fishing Quota Referenda". www.govinfo.gov. Retrieved 2022-08-25.
- ^ "Mayor Butler v Watson" (PDF). Supreme Court of Mississippi. 2021.
- ^ Gamble, Barbara S. (1997). "Putting Civil Rights to a Popular Vote". American Journal of Political Science. 41 (1): 245–269. doi:10.2307/2111715. JSTOR 2111715.
- ^ Hajnal, Zoltan; Gerber, Elisabeth R.; Louch, Hugh (2002). "Minorities and Direct Legislation: Evidence from California Ballot Proposition Elections". Journal of Politics. 64: 154–177. doi:10.1111/1468-2508.00122. S2CID 27773706.
- ^ Gray, Virginia & Russell L. Hanson. Politics in the American States. 9 ed. Washington, DC: CQ Press, 2008. p. 141.
- ^ "Was the Price Too High for Colorado Initiative Deal? - WSJ.com". Online.wsj.com. 2008-10-13. Retrieved 2010-06-17.
- ^ [1][dead link]
- ^ "Vote NO on Prop 105 » In The News". Thevotersofaz.com. Archived from the original on 2011-07-17. Retrieved 2010-06-17.
- ^ John Diaz (2008-10-12). "A long way from the grassroots". Sfgate.com. Retrieved 2010-06-17.
- ^ Golden, Tim (1997-04-17). "Medical Use of Marijuana To Stay Illegal in Arizona - NYTimes.com". New York Times. Retrieved 2010-06-17.
- ^ "The Pueblo Chieftain Online :: Referendum O limits constitutional changes". Chieftain.com. Retrieved 2010-06-17.
- ^ "mansfieldnewsjournal.com". Retrieved October 20, 2008.[dead link]
- ^ Betsy Z. Russell (3 Apr 2013). "Idaho governor signs bill tightening initiative rules". The Spokesman-Review. Archived from the original on 21 July 2021. Retrieved 23 July 2021.
- ^ PFANNENSTIEL, KYLE (2018-04-14). "Medicaid expansion petition 6,000 away from target, still need to wrap up 11 districts". Idaho-Press Tribune. Retrieved 2018-04-15.
- ^ Russell, Betsy (2018-04-19). "Medicaid expansion initiative in final push, just 5,000 signatures from goal". The Spokesman-Review. Retrieved 2018-04-19.
- ^ Manny, Bill (2018-04-13). "Luke Mayville and his Medicaid for Idaho campaign are proving us political 'experts' wrong". Idaho Statesman. Retrieved 2018-04-14.
- ^ Manny, Bill (2018-05-01). "60,000 signatures & counting: How did the upstart Medicaid expansion campaign do it?". The Idaho Statesman. Retrieved 2018-05-01.
- ^ Epstein, Reid (May 22, 2021). "Republicans Move to Limit a Grass-Roots Tradition of Direct Democracy". The New York Times.
- ^ "The California Initiative Process: Background and Perspective" (PDF). Retrieved 23 July 2021.
- ^ "Proxy voting". Retrieved October 21, 2008.[dead link]
- ^ "State of Oregon: Citizens' Initiative Review Commission". oregon.gov. Archived from the original on 2014-07-14. Retrieved 2014-06-13.
Further reading
- David Daley (October 7, 2020), "Courts Are Taking Away One of Americans' Best Options for Fixing Voting", Theatlantic.com
- Direct Democracy in the States (Report) (2023) by statedemocracy.law.wisc.edu
External links
- Ballot Measures overview at Ballotpedia
- Ballot Measures Database Archived 2011-07-01 at the Wayback Machine and Initiative & Referendum Legislation Database Archived 2011-06-30 at the Wayback Machine by National Conference of State Legislatures
- Rose Institute of State and Local Government, Miller-Rose Initiative Database, Claremont, CA: Claremont McKenna College,
Statewide initiatives adopted by voters...1904 through 2018