Amendment 6 passes in Missouri after supporters significantly outspend opponents in Missouri
ST. LOUIS (KMIZ)
Missouri voters approved Amendment 6 on Tuesday, making it harder for state lawmakers to change or repeal laws approved through the citizen initiative petition process.
The amendment passed with roughly 60% of the vote.
Amendment 6 changes the Missouri Constitution to strengthen protections for citizens’ initiative and referendum powers. Under the amendment, lawmakers will need at least 80% approval in both the Missouri House and Senate to send a proposed change to a voter-approved initiative law back to the ballot.
Voters would then have to approve the change.
Supporters said the amendment will protect the will of voters and prevent lawmakers from undoing policies approved at the ballot box. Opponents argued it will limit the Legislature’s ability to respond to changing circumstances and adjust state law.
The amendment also declares initiative and referendum rights fundamental under the Missouri Constitution. It restricts lawmakers’ ability to weaken the process, including by increasing signature requirements, shortening the time available to collect signatures, or adding other requirements for petitioners.
The Missouri Republican Party and the Missouri Chamber of Commerce and Industry were among the most vocal opponents of Amendment 6.
However, the measure received strong support from labor unions across the state, including the Missouri AFL-CIO and Missouri National Education Association. Supporters of Amendment 6 also significantly outspent opponents. Campaign finance reports show more than $8 million spent in support, compared with $109,627 in opposition spending, all of which came from the Mo Protect PAC.
Meanwhile, the Missouri AFL-CIO contributed $1,173,497 to the campaign, the largest donation from any single contributor. The Sheet Metal Workers International Association Local Union No. 36, which hosted an election night watch party in St. Louis, also donated $300,000 in support.
Organizers for the Yes on 6 campaign told ABC 17 News they held 25 town halls across the state and had 2,500 volunteers.
Other organizations supporting Amendment 6 include the Missouri Democratic Party, Empower Missouri, Metropolitan Congregations United, Missouri Action Alliance, Missouri NAACP State Conference, Missouri National Organization for Women, Missouri NORML, Show Me Integrity, Sierra Club Missouri Chapter and Veterans for All Voters.
“For 118 years, Missourians have had the constitutional right to put initiatives on the ballot and to vote on those things. We’ve seen those under attack recently here in the state of Missouri,” Jack Cardetti, a spokesperson for the “Yes on 6” campaign, told ABC 17 News. “We’re really thankful to have all of the support we have, from working families and from other organizations that want to make sure that we continue to have a way to hold politicians accountable when they’re ignoring our voices.”
Over the past 50 years, 21 changes to the state’s constitution have come through citizen initiative petitions.
Notable measures approved in the past decade include medical marijuana in 2018, Medicaid expansion in 2020, recreational marijuana in 2022, sports betting in 2024 and a 2024 constitutional amendment establishing reproductive freedom.
The 2024 sports betting measure passed by fewer than 3,000 votes, making it the narrowest victory among the 21 successful initiative petitions.
However, state lawmakers have since reversed or modified some of those voter-approved initiatives, making Amendment 6 a pivotal measure in the ongoing debate over the future of Missouri’s citizen-led initiative petition process.
This includes advancing a proposed constitutional amendment that would repeal the 2024 reproductive freedom protections and replace them with more restrictive abortion provisions.
Supporters of Amendment 6 also pointed to Proposition A, approved by Missouri voters in 2024, as an example of why they believe the initiative process needs stronger protections.
Proposition A raised the state’s minimum wage and required employers to provide paid sick leave. In July 2025, Gov. Mike Kehoe signed a House bill that repealed the paid sick leave requirement and the automatic inflation adjustments approved by voters.
With Amendment 6 now approved, lawmakers will face a much higher threshold to send proposed changes to voter-approved initiative laws back to the ballot.
“We’ve heard from a lot of voters that they’re just sick and tired of them going through the whole process to put something on the ballot, vote for it, only to see politicians return to Jeff City and overturn it,” Cardetti said. “The beautiful thing about Amendment 6 is that it’s not about any one issue. It’s about having that right and making sure that we’re able to have an issue of petition process here in Missouri, and also making sure that the ballot summaries that are on these are unbiased, clear and easy to understand.”
Under previous law, citizens could use initiative petitions to propose constitutional amendments and state statutes. Voters could also use veto referendums to challenge legislation passed by the General Assembly.
To qualify a measure for the ballot, petitioners had to collect signatures from registered voters in at least two-thirds of Missouri’s congressional districts. The required number of signatures was based on the votes cast for governor in each district. Constitutional amendments required signatures equal to 8% of the votes cast for governor, while statutes and veto referenda required 5%.
Previously, voter-approved state statutes could be amended or repealed by the Legislature through the regular legislative process. Changing a voter-approved constitutional amendment required another constitutional amendment approved by voters.
Amendment 6 adds a higher threshold for lawmakers seeking to refer changes to voter-approved initiative laws back to voters.
Less than an hour before polls closed, Cardetti told ABC 17 News he was confident Amendment 6 would pass, pointing to voters’ rejection of Amendment 4 in August, a separate proposal that would have required initiative petitions to receive majority support in all eight congressional districts, rather than simply winning a statewide majority.
“More than 80% of Missourians in August went and voted against Amendment 4. Amendment 6 is just the opposite. So we’re really, really enthusiastic,” Cardetti said. “We have support from Democrats, Republicans, and Independents. This isn’t a partisan issue. In fact, most of our opposition is coming from the politicians themselves.”
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