Voters face a November 3 veto referendum, Proposition A, on House Bill 1, the mid-decade congressional map enacted in 2025 to shift lines in the Kansas City area. A “yes” vote would uphold the new boundaries; a “no” vote would repeal them and retain the prior plan. The Missouri Supreme Court ruled unanimously on September 3 that the referendum petition met constitutional requirements, ordered certification, and blocked use of the new map until voters decide. The secretary of state issued the certificate on September 8, though Missouri’s attorney general has sought U.S. Supreme Court review amid parallel federal litigation over which map applies to the general election. Trader consensus slightly favoring rejection reflects the organized opposition campaign, public response to the mid-decade redraw, and the measure’s status as a competitive ballot contest less than two months out.