Incumbent Democrat Joaquin Castro secured his party's nomination with roughly 88% in the March 2026 primary for Texas's 20th congressional district, facing only nominal Republican opposition from Edgardo Baez in the November general. The San Antonio-centered seat's demographics, including a large Hispanic electorate that has consistently supported Democratic candidates by wide margins in recent cycles, underpin trader consensus reflected in the 94.5% Democratic probability. Castro's long tenure since 2013 and the absence of competitive challengers or major district-specific shifts have reinforced this positioning. Scenarios that could narrow the gap include an unforeseen national Republican surge, candidate health developments, or late legal issues, though structural factors make such shifts improbable before Election Day.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · UpdatedTX-20 House Election Winner
$26,839 Vol.
$26,839 Vol.
Democratic Party
95%
Republican Party
6%
$26,839 Vol.
$26,839 Vol.
Democratic Party
95%
Republican Party
6%
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/).
Market Opened: Jan 28, 2026, 11:24 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 Joaquin Castro secured his party's nomination with roughly 88% in the March 2026 primary for Texas's 20th congressional district, facing only nominal Republican opposition from Edgardo Baez in the November general. The San Antonio-centered seat's demographics, including a large Hispanic electorate that has consistently supported Democratic candidates by wide margins in recent cycles, underpin trader consensus reflected in the 94.5% Democratic probability. Castro's long tenure since 2013 and the absence of competitive challengers or major district-specific shifts have reinforced this positioning. Scenarios that could narrow the gap include an unforeseen national Republican surge, candidate health developments, or late legal issues, though structural factors make such shifts improbable before Election Day.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · Updated

Beware of external links.
Beware of external links.
Frequently Asked Questions