Texas Attorney General Ken Paxton defeated longtime U.S. Senator John Cornyn in the Republican Senate runoff, delivering a major victory for President Donald Trump and a painful defeat for the GOP establishment. Paxton’s win comes after a bitter and expensive race that tested Trump’s influence over the Republican Party in one of the nation’s most important conservative states. Paxton will now face Democratic state Rep. James Talarico in the November general election.
The result is historically significant because Cornyn was no ordinary incumbent. He had served in the Senate since 2002, built deep relationships across Texas Republican politics, and held major leadership roles in Washington. He tried for more than a year to show loyalty to Trump and prove he supported the president’s agenda. But in the end, it was not enough. Trump endorsed Paxton late in the race, and Paxton used that support to present himself as the true MAGA candidate against a Washington insider.
Paxton’s victory also shows how much Republican primary voters continue to prioritize loyalty to Trump over traditional markers of party seniority, experience, or electability. Cornyn had the backing of many establishment Republicans and significantly outspent Paxton. The Houston Chronicle reported that Cornyn and his allies spent about $22.5 million on advertising, compared with about $6.7 million from Paxton and his allies. But Paxton still won decisively, proving that money and incumbency could not overcome Trump’s endorsement and grassroots conservative anger.
The race was deeply personal and highly negative. Cornyn’s campaign attacked Paxton over his long record of legal and ethical controversies, including his 2023 impeachment by the Texas House over allegations that he abused his office. Paxton was later acquitted by the Texas Senate, but the scandals have continued to follow him. Cornyn argued that Paxton would be a risky nominee who could make a safe Republican seat more competitive. Paxton responded by portraying Cornyn as a creature of Washington who had lost touch with Texas conservatives.
The outcome could create problems for Republicans in the general election. Some political analysts now see Texas as more competitive because Paxton’s vulnerabilities may give Democrats an opening. Talarico has already moved quickly to frame the race as “The People vs. Ken Paxton,” attacking Paxton as corrupt and linking political scandal to the economic struggles of everyday Texans. After Paxton’s runoff win, Talarico reportedly raised $600,000 in two hours, a sign that Democrats believe the race could become nationally important.
Still, Texas remains a Republican-leaning state, and GOP leaders are now trying to unify behind Paxton. Senate Majority Leader John Thune, who had supported Cornyn, shifted to backing Paxton after the runoff, emphasizing the need to keep the Senate under Republican control. That shows the party’s practical calculation: even if many Republicans worry about Paxton’s baggage, they cannot afford to lose a Texas Senate seat.
Overall, Paxton’s win is a powerful sign of Trump’s continued dominance inside the Republican Party. Cornyn did almost everything possible to avoid Trump’s opposition, but once the president chose Paxton, the race moved sharply against him. The result ends Cornyn’s long Senate career, elevates one of Texas’s most controversial conservatives, and turns a normally safe Republican race into one of the most closely watched contests of the 2026 midterms.
