Incumbent Democrat Joaquin Castro secured renomination in the March 2026 primary with nearly 88 percent of the vote in Texas’s 20th Congressional District, which encompasses much of San Antonio and carries a substantial Democratic lean reflected in its partisan voting index. The Republican nominee, Edgardo Baez, emerged from an uncontested primary in a district long rated Solid Democratic by nonpartisan analysts. With the general election set for November 2026, traders view the seat as safely held by the Democratic Party absent any unforeseen late-cycle developments such as a significant scandal involving the incumbent or an extraordinary national political shift capable of overcoming the district’s structural partisan advantage.