Detroit

Detroit’s Mary Waters Knocked Out Of 13th District Primary

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Published on May 20, 2026
Detroit’s Mary Waters Knocked Out Of 13th District PrimarySource: City of Detroit, Public domain, via Wikimedia Commons

Detroit’s 13th Congressional District just lost one of its best-known challengers. At-large Councilwoman Mary Waters has been ruled off the Aug. 4 Democratic primary ballot after election officials said her nominating petitions did not survive a validity review, a move that could leave state Rep. Donavan McKinney as the lone Democrat facing incumbent U.S. Rep. Shri Thanedar.

The Michigan Department of State listed Waters as disqualified on its official candidate roster after Wayne County canvassers flagged problems with the number of valid signatures on her nominating petitions, according to a report from The Detroit News. Waters told reporters she had been informed of the shortfall and has already appealed the county finding to the Michigan Bureau of Elections, the outlet reported.

Signature Review And The Immediate Challenge

Wayne County canvassers scrutinized Waters’ nominating petitions, and a county source told reporters she turned in about 1,500 signatures. After review, officials concluded she did not have enough signatures that could be counted as valid. If that determination holds, Waters will stay off the August ballot, and McKinney would effectively become the only Democrat in the primary, according to the Michigan Chronicle.

What It Means For Detroit’s Most Reliable Blue Seat

Michigan’s 13th District is anchored in Detroit and stretches into Downriver communities and the Grosse Pointes, making it one of the safest Democratic seats in the state. Thanedar, who has largely self-funded his congressional campaigns, would suddenly be facing a much thinner primary field if Waters remains off the ballot. That potential shake-up, and the short-term scramble now facing organizers and donors who had been betting on a multi-candidate race, was outlined by The Detroit News.

How The Appeal Process Plays Out

The Michigan Bureau of Elections is responsible for reviewing the work of county canvassers and must issue a staff report before the Board of State Canvassers takes any final action. That window gives candidates and their challengers a chance to review the petitions, signatures, and objections. Under state law, the board can hold hearings, issue subpoenas, and decide whether a candidate has submitted enough valid signatures to qualify for the ballot. Those same rules will govern Waters’ appeal, as outlined in the election procedures set out by the Michigan Legislature.

Political Fallout And What Comes Next

McKinney’s campaign has already lined up support from progressive figures and organizations, including an endorsement from Sen. Bernie Sanders, according to his listed backers on Donavan McKinney for Congress. If he ends up as Thanedar’s only primary opponent, those endorsements could quickly become the organizing backbone of the anti-incumbent effort, as described in coverage from the Michigan Chronicle.

Waters, a former state representative who was reelected to Detroit’s at-large council last fall, has said her campaign will exhaust its administrative options while continuing outreach and organizing. Whether that work results in her name returning to the ballot now depends on how state election officials rule on the signature dispute.

Her appeal will move forward on a timeline set by the Bureau of Elections and the Board of State Canvassers. The final decision will determine who Detroit Democrats actually see on their August ballot, and it has already turned a closely watched primary into an early-season shake-up.