The Missouri Supreme Court’s unanimous September 3 ruling certified the veto referendum (Proposition A) for the November 3 ballot and suspended the 2025 Republican-drawn congressional map until voters decide, shifting focus to whether Missourians will uphold or reject the mid-decade changes. Traders assign a modest edge to rejection, reflecting the measure’s origin as a partisan redraw targeting the Kansas City district, the collection of over 300,000 signatures by opponents, and Missouri’s precedent of voters using referendums to block legislative redistricting plans. The secretary of state’s subsequent September 8 certification confirmed placement, while potential U.S. Supreme Court review and the November timeline remain the primary variables that could alter the balance before election day.