- Will the Democratic Party win the CA-04 House seat?73¢
- Will the Republican Party win the CA-04 House seat?6¢
In California's 4th Congressional District, redistricting under Proposition 50 and the June 2026 top-two primary produced an all-Democratic general election matchup on November 3 between longtime incumbent Mike Thompson and challenger Eric Jones. Republican candidates split the primary vote, with the strongest finishing third and failing to advance in a district rated Solid or Safe Democratic by forecasters due to its D+8 partisan lean and voter registration edge. This structure drives the market's strong consensus favoring the Democratic Party, reflecting the absence of a Republican on the ballot and the district's consistent electoral patterns. A Republican victory would require unprecedented late-cycle shifts, such as widespread voter realignment or disqualification events, which lack supporting indicators at present.
Rules
This market will resolve according to the party of the candidate who wins the CA-04 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/).