**Missouri Proposition A, a veto referendum on the 2025 congressional map (HB 1), faces significant headwinds ahead of the November 3, 2026 ballot.** The Republican-drawn lines, enacted in a special session and signed by Gov. Mike Kehoe, aim to strengthen GOP majorities by adjusting districts around Kansas City. Opponents collected over 305,000 signatures to suspend the map via referendum, prevailing after the Missouri Supreme Court unanimously ruled on September 3 that the measure qualifies for the ballot and the 2022 lines remain in effect for this election. The U.S. Supreme Court declined to intervene. Voter rejection aligns with Missouri’s record of using referendums to block legislative redistricting efforts, combined with organized opposition from groups like People Not Politicians and late Republican campaigning for approval. Amendment 6 on the same ballot, which would raise hurdles for altering voter initiatives, adds procedural context. Traders price “No” at 73.5% based on these structural and historical dynamics.