MO-03 House Election Winner
- Will the Republican Party win the MO-03 House seat?91¢
- Will the Democratic Party win the MO-03 House seat?8¢
This market will resolve according to the party of the candidate who wins the MO-03 congressional district seat in the U.S. House of Representatives in the 2026 midterm elections. The midterm elections will take place on November 3, 2026. A candidate's party will be determined by their ballot-listed or otherwise identifiable affiliation with that party at the time all of the 2026 House elections are conclusively called by this market's resolution sources. A candidate without a ballot-listed affiliation to either the Democrat or Republican parties will be considered a member of one of these parties based on the party with which they most recently expressed their intent to caucus at the time all of the House elections are conclusively called by this market's resolution sources. This market will resolve based on the result of the election as indicated by a consensus of credible reporting. If there is ambiguity, this market will resolve based solely on the official results as reported by the United States government, specifically the Federal Election Commission (https://www.fec.gov/).
Republican incumbent Bob Onder's strong position in Missouri's 3rd congressional district stems from the seat's consistent Republican lean, demonstrated by his 2024 victory margin and the district's partisan voting index favoring the party by double digits. Recent August 2026 primaries reinforced this, with Onder securing the Republican nomination and Democrat Bethany Mann advancing as the challenger in a low-drama process. Cook Political Report rates the race Solid Republican, aligning with trader consensus that reflects incumbency advantages, limited Democratic infrastructure in the district, and historical turnout patterns. Potential shifts could arise from major scandals, health developments affecting the incumbent, or unexpected national political realignments before November, though such factors have rarely overcome the underlying structural advantages in comparable cycles.