**Missouri voters will decide on November 3, 2026, via veto referendum (Proposition A) whether to uphold or repeal the 2025 legislative map (HB 1) that redraws congressional districts, primarily affecting the Kansas City area.** A “yes” vote would enact the new boundaries; a “no” would retain the 2022 map. After signature collection exceeded requirements and prolonged litigation, the Missouri Supreme Court unanimously ruled on September 3 that the referendum is valid under the state constitution, ordered certification, and barred use of the new map for the November election. The secretary of state complied on September 8, and the U.S. Supreme Court declined to intervene. The measure reached the ballot only after Republican-led efforts to block it and Democratic-backed challenges succeeded. Trader consensus favoring rejection reflects the referendum’s origin as a direct voter check on mid-decade redistricting, the use of the prior map in the general election, and the absence of strong polling momentum for approval amid ongoing partisan disputes. Upcoming campaign activity and any last-minute legal developments could still shift positioning before Election Day.