Incumbent Democrat Jim Costa holds a structural edge in California's 21st congressional district, where the Cook Partisan Voter Index registers a D+4 to D+6 lean and Democrats maintain a sizable registration advantage over Republicans. Costa's moderate record and consistent reelection in this Central Valley seat, including a 2024 victory by roughly five points, underpin trader expectations of continued Democratic control. Multiple Republicans, including recent entrant Kyle Kirkland and Lorenzo Rios, have launched challenges ahead of the June 2 primary, yet none has demonstrated the fundraising or name recognition to close the gap. The implied 87.5% probability for Democrats captures these fundamentals while leaving room for shifts from primary turnout or broader midterm dynamics.
Experimentelle KI-generierte Zusammenfassung mit Polymarket-Daten. Dies ist keine Handelsberatung und spielt keine Rolle bei der Auflösung dieses Marktes. · AktualisiertCA-21 Wahlsieger
Demokratische Partei
88%
Republikanische Partei
12%
Demokratische Partei
88%
Republikanische Partei
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/).
Markt eröffnet: 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 holds a structural edge in California's 21st congressional district, where the Cook Partisan Voter Index registers a D+4 to D+6 lean and Democrats maintain a sizable registration advantage over Republicans. Costa's moderate record and consistent reelection in this Central Valley seat, including a 2024 victory by roughly five points, underpin trader expectations of continued Democratic control. Multiple Republicans, including recent entrant Kyle Kirkland and Lorenzo Rios, have launched challenges ahead of the June 2 primary, yet none has demonstrated the fundraising or name recognition to close the gap. The implied 87.5% probability for Democrats captures these fundamentals while leaving room for shifts from primary turnout or broader midterm dynamics.
Experimentelle KI-generierte Zusammenfassung mit Polymarket-Daten. Dies ist keine Handelsberatung und spielt keine Rolle bei der Auflösung dieses Marktes. · Aktualisiert
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