Incumbent Democrat Jim Costa advanced from California's June 2, 2026, top-two primary alongside Republican Kyle Kirkland, setting up the November general election in the Central Valley district. The seat carries a Democratic partisan voting index around D+4 to D+5 and favored Kamala Harris by roughly six points in the prior cycle, aligning with Costa's 52.6 percent reelection margin in 2024. Nonpartisan ratings classify the race as Likely Democratic, reflecting the incumbent's established fundraising and voter base in a district with a Democratic registration edge. These structural factors underpin trader consensus assigning the Democratic Party an 88 percent implied probability of retaining the seat.
Résumé expérimental généré par IA à partir des données Polymarket. Ceci n'est pas un conseil de trading et ne joue aucun rôle dans la résolution de ce marché. · Mis à jourVainqueur de l'élection à la Chambre CA-21
Parti démocrate
88%
Parti républicain
12%
Parti démocrate
88%
Parti républicain
12%
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/).
Marché ouvert : Jan 28, 2026, 12:08 AM ET
Resolver
0x2F5e3684c...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/).
Resolver
0x2F5e3684c...Incumbent Democrat Jim Costa advanced from California's June 2, 2026, top-two primary alongside Republican Kyle Kirkland, setting up the November general election in the Central Valley district. The seat carries a Democratic partisan voting index around D+4 to D+5 and favored Kamala Harris by roughly six points in the prior cycle, aligning with Costa's 52.6 percent reelection margin in 2024. Nonpartisan ratings classify the race as Likely Democratic, reflecting the incumbent's established fundraising and voter base in a district with a Democratic registration edge. These structural factors underpin trader consensus assigning the Democratic Party an 88 percent implied probability of retaining the seat.
Résumé expérimental généré par IA à partir des données Polymarket. Ceci n'est pas un conseil de trading et ne joue aucun rôle dans la résolution de ce marché. · Mis à jour
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