The U.S. Supreme Court rejected Missouri Republicans' attempt to defend redistricting maps that violated state constitutional provisions governing legislative districts.
Missouri's state constitution prohibits partisan gerrymandering and requires that state Senate districts remain compact and contiguous. Missouri Republicans redrew maps that violated these express requirements, then sought federal court intervention when state courts blocked the illegal maps.
The Supreme Court declined to entertain the Republicans' challenge. The justices refused to overturn or enjoin Missouri state courts' application of Missouri's own constitutional limits on redistricting. This represents a clear boundary: federal courts will not intervene when state courts enforce state constitutional restrictions on partisan mapmaking.
The decision reinforces that states retain authority to police their own redistricting through state constitutional law and state court enforcement. Federal intervention in redistricting disputes typically requires federal constitutional violations, not mere state law disputes over how maps should be drawn.
For Republicans in Missouri, the loss means the state courts' invalidation of their maps stands. The maps must comply with Missouri's compactness and contiguity requirements. For the broader political landscape, the ruling signals the Supreme Court will not serve as an appellate body for redistricting disputes rooted in state law.
This contrasts with cases involving federal constitutional gerrymandering claims under the First Amendment or the Voting Rights Act, where federal courts retain jurisdiction. Here, the Republicans asked the federal judiciary to override state court interpretations of state constitutional text. The Supreme Court simply said no.
The outcome carries practical weight for future redistricting cycles. State courts in jurisdictions with strong constitutional redistricting protections now have clearer confirmation that federal courts will not second-guess their enforcement of those state provisions. Political parties cannot use federal litigation to escape state constitutional requirements.
Missouri will proceed with maps that comply with state law. The Republicans must either accept maps drawn under state constitutional constraints or pursue legislative amendment of Missouri's