Democratic incumbent Jim Costa seeks re-election in California's 21st congressional district for the November 2026 general election, with the nonpartisan primary set for June 2. The seat carries a Likely Democratic rating from multiple nonpartisan analysts following redistricting under Proposition 50, reflecting the district's partisan composition and Costa's consistent performance, including his 2024 victory by a 5.2-point margin. Recent candidate filings show a crowded primary field with Democratic and Republican challengers, yet no developments have altered the district's underlying lean or Costa's fundraising and name-recognition advantages. Trader consensus pricing these outcomes near 88 percent Democratic and 12 percent Republican aligns with the structural factors favoring the incumbent party in this Central Valley contest.
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...Democratic incumbent Jim Costa seeks re-election in California's 21st congressional district for the November 2026 general election, with the nonpartisan primary set for June 2. The seat carries a Likely Democratic rating from multiple nonpartisan analysts following redistricting under Proposition 50, reflecting the district's partisan composition and Costa's consistent performance, including his 2024 victory by a 5.2-point margin. Recent candidate filings show a crowded primary field with Democratic and Republican challengers, yet no developments have altered the district's underlying lean or Costa's fundraising and name-recognition advantages. Trader consensus pricing these outcomes near 88 percent Democratic and 12 percent Republican aligns with the structural factors favoring the incumbent party in this Central Valley contest.
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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