With less than two months until the general election in November, a coalition urging Michigan residents to vote no on a proposed constitutional convention continues to grow.

The Michigan Chapter of the Working Families Party on Monday announced it would join a bipartisan coalition made up of business advocates, community leaders, labor unions and other political stakeholders in opposition to a constitutional convention, also known as a Con-Con. 

Every 16 years, Michigan’s Constitution requires voters to determine whether the state should hold a constitutional convention. If the measure passes, a slate of 148 delegates would gather and determine what changes, if any, should be made to the state Constitution. Each delegate would be selected through a partisan election process, with one representative for each state House and Senate district.

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Changes could range from small tweaks to a complete overhaul, with members of Protect MI Constitution From Special Interests, the opposition coalition, arguing that approving a Con-Con would open up the state Constitution to influence from wealthy special interest groups. 

Changes must be agreed upon by a majority of the delegates, and would need to be approved by Michigan voters.

“Working people in Michigan have spent generations fighting for the rights and protections that make it possible to build a life with dignity,” Branden Snyder, director of the Working Families Party in Michigan said in a news release. “We shouldn’t put those gains on the bargaining table and give corporations, wealthy special interests, and the well-connected another opportunity to rewrite the rules against working families. A Constitutional Convention creates too much uncertainty and there’s simply no reason to take that risk.”

Other members of the opposition coalition include American Civil Liberties Union of Michigan, the Michigan Chamber of Commerce, the Michigan AFL-CIO, the Michigan Education Association and several other organizations and policymakers.

“Working Michiganders can’t afford gas or groceries — and they definitely can’t afford a Con-Con,” Ron Bieber, president of the Michigan AFL-CIO, said in a statement. “Holding a Michigan Constitutional Convention would open up a Pandora’s Box of special interest carveouts that put billionaires and corporations first when we can least afford it. It’s too risky.”

A recent poll of 600 likely voters commissioned by The Detroit News and WDIV Channel 4 and conducted by the Lansing-based Glengariff Group found 47% of voters would support a Constitutional Convention. Thirty-one percent were opposed while 22% were uncertain. 

During the last vote, held in 2010, 67% of voters rejected the proposal.