The 2026 Texas Republican primary runoff elections were held on May 26. In the high-profile U.S. Senate race, Attorney General Ken Paxton defeated four-term incumbent Senator John Cornyn by a wide margin, receiving approximately 63.8% of the vote (around 886,000 votes) to Cornyn’s 36.2% (around 502,000 votes). Cornyn, first elected in 2002, had served four full terms and held significant leadership roles in the Senate Republican caucus. This result marked the first time a Texas Republican senator lost renomination in a primary.

Such outcomes are rare in U.S. Senate elections. Historical data shows that only about 4-5% of incumbent senators seeking renomination lose their primaries since the mid-20th century. Long-serving incumbents with four terms or more enjoy substantial advantages in name recognition, fundraising, and party networks, making successful challenges uncommon. Cornyn’s defeat stands out as an exception to this pattern, joining a small list of senators like Richard Lugar (R-IN) in 2012 who were unseated after long tenures.

Broader Texas GOP runoff results included mixed outcomes, with some challengers prevailing in other statewide and congressional races while several incumbents advanced. Low runoff turnout often amplifies the voice of highly engaged voters. Overall, these primary contests demonstrate how internal party accountability can occasionally overcome traditional incumbent protections, though such losses remain infrequent at the Senate level. Paxton advances to face Democrat James Talarico in November.

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