Voters will decide Proposition A on November 3, 2026, a veto referendum on House Bill 1, the 2025 congressional map enacted outside the standard decennial cycle to favor Republicans with seven of eight seats. The Missouri Supreme Court unanimously validated the referendum in September after opponents collected over 300,000 signatures, blocking HB 1 from taking effect until voter approval and reverting to 2022 boundaries for the current election cycle. Trader expectations that the measure fails reflect its origin as a partisan mid-decade redraw targeting Kansas City districts, Missouri’s precedent of rejecting similar legislative redistricting efforts via referendum, and the measure’s alignment with broader ballot fights over initiative processes and electoral maps. No major late developments have altered this positioning ahead of the vote.