Mark Teixeira secured the Republican nomination for Texas’s 21st Congressional District in the March 2026 primary with 60.9 percent of the vote in a crowded field, benefiting from endorsements by President Trump and Governor Greg Abbott along with substantial fundraising and name recognition as a former MLB All-Star. The open seat, vacated by Chip Roy, sits in a district with a strong Republican lean that Trump carried by double digits in recent cycles, reinforced by post-2024 redistricting. Democratic nominee Kristin Hook, a scientist and 2024 repeat candidate who won her primary, faces structural headwinds including limited campaign resources and the district’s partisan composition. Trader consensus reflects these fundamentals, though late developments such as scandals, health events, or unusually high opposition turnout could still alter the outcome before the November 3 general election.