How Missouri’s Congressional Map Dispute Unfolded

Missouri’s November 2026 congressional election will use the map adopted in 2022, following a legal dispute over a replacement map and voters’ right to approve or reject it. On Sept. 25, the U.S. Supreme Court stayed federal orders requiring the newer map, leaving the earlier districts in place.

The dispute began when Missouri lawmakers enacted a replacement congressional map in 2025, three years after adopting the previous one. Opponents submitted roughly 300,000 signatures seeking a referendum, delivering the petitions to Secretary of State Denny Hoskins in December 2025, before the law was scheduled to take effect.

The litigation initially addressed the Legislature’s authority to redraw districts and whether the new map met state constitutional requirements. The Missouri Supreme Court upheld that authority and rejected the challenge to the districts’ compactness and population equality. In May, it also ruled that submitting referendum petitions did not automatically suspend the law while signature verification remained pending. Missouri subsequently used the 2025 map for its August primary.

The referendum question remained unresolved. Hoskins declared the petition insufficient because he concluded that congressional redistricting was not subject to Missouri’s referendum process. On Sept. 3, the Missouri Supreme Court unanimously rejected that interpretation and ruled that the petition was legal, sufficient, and timely. The court concluded that the 2025 map could not take effect without voter approval and that the 2022 map must govern November’s election.

Voters and candidates then sued in federal court, arguing that the U.S. Constitution required Missouri to use the 2025 map. A district court ordered its use on Sept. 8, but the U.S. Supreme Court stayed that order two days later. On Sept. 21, the Eighth Circuit directed the district court to require the newer map again.

The Supreme Court intervened on Sept. 25, staying those subsequent orders. In its unsigned opinion, the Court rejected the lower courts’ application of Purcell, the principle discouraging federal courts from changing election rules close to voting. It explained that this restriction does not generally prevent states from resolving their own election-law questions, subject to federal law. The Court also noted that the Missouri Supreme Court had identified the referendum’s potential effect months before the primary.

The resulting arrangement separates two decisions: voters will elect representatives under the 2022 map in November and separately decide whether to approve the 2025 replacement.

The case underscores the importance of clarity in election administration and redistricting. Voters, candidates, and election officials need understandable rules, clear deadlines, and a predictable process for resolving disputes. Questions about which map governs an election—and how a referendum affects that decision—should be settled well before voting begins, not left to a series of last-minute changes.

Clarity helps build confidence because people can understand not just what the rules are, but how decisions are made and who is responsible for making them. Voters do not have to agree with every outcome to have confidence in a process they can follow. When procedures are transparent and applied consistently, people have a stronger basis for evaluating whether decisions reflect established rules rather than shifting political interests.

That is why avoiding changes close to an election matters. Election officials need time to prepare accurate ballots and communicate with voters; candidates need to know which communities they are seeking to represent; and voters need reliable information about their districts and choices. Clear procedures cannot eliminate disagreement, but they can keep uncertainty about the process from becoming distrust of the election itself.