- Will the Democratic Party win the CA-01 House seat?94¢
- Will the Republican Party win the CA-01 House seat?5¢
Redistricting through Proposition 50 shifted California’s 1st Congressional District westward to incorporate Democratic-leaning areas such as Santa Rosa and parts of Sonoma County, transforming it from a solidly Republican seat under prior lines into one rated solid Democrat by the Cook Political Report. This change followed Republican James Gallagher’s June 2026 special election victory under the old boundaries and his narrow 42.1%–41.8% primary win over Democrat Mike McGuire for the full term. Recent candidate forums have highlighted policy contrasts on taxes, water infrastructure, health care, and foreign policy, yet trader consensus reflected in the 92.7% implied probability for McGuire aligns with the district’s new partisan composition and historical base rates for incumbents in altered maps. Late-breaking developments such as turnout surges, scandals, or national events could still alter the result before the November 3 general election.
Rules
This market will resolve according to the party of the candidate who wins the CA-01 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/).