Texas Attorney General Ken Paxton defeated Senator John Cornyn in a Republican run-off primary on Tuesday night, marking a stunning upset for an incumbent who served 23 years in Congress, including 12 years as a high-ranking member of the Senate Republican leadership team. The outcome sets up what will be a closely watched November general election contest between Paxton and his Democratic opponent, state legislator James Talarico, with control of the US Senate potentially hanging in the balance for the final two years of President Donald Trump's term.
The bruising primary contest became the most expensive Senate primary campaign in US history. While Cornyn outspent Paxton by a 9-to-1 margin, Trump ultimately endorsed the challenger after it appeared increasingly likely he would prevail. The outcome also came just 10 days after Louisiana Senator Bill Cassidy lost his Republican primary to a Trump-endorsed challenger, making this cycle historically rare for incumbent defeats within the same party.
What the Left Is Saying
Democratic strategists have signaled optimism following Paxton's victory, viewing him as a potentially weaker general election candidate than Cornyn. Many in the party see an opportunity to flip a Senate seat in Texas, a state that has not elected a Democrat to the Senate since 1988. 'We just made history,' Paxton said in his victory remarks.
James Talarico, Paxton's Democratic opponent, is expected to frame the general election race as a choice between experience and scandal. Paxton has faced legal troubles over the years, including securities fraud charges that were eventually dismissed. Democrats have noted that Paxton has already begun airing television advertisements attacking Talarico as a 'left-wing extremist,' suggesting an aggressive general election campaign strategy.
National Democratic groups are likely to pour resources into Texas for the first time in years. The outcome of this race could be decisive in determining whether Democrats win back Senate control, giving them significant influence over Trump's legislative agenda and judicial appointments through at least 2028.
What the Right Is Saying
Trump celebrated Paxton's victory on his Truth Social platform, posting that Paxton 'will become a fantastic, common sense senator.' The president also congratulated Cornyn for running 'a strong and powerful race' and called him 'a truly great career' senator while maintaining they would remain friends.
The win is being characterized by Republicans as another demonstration of Trump's endorsement power. Trump had accused Cornyn of being 'very disloyal,' arguing he did not fight hard enough to save Trump's voting reform legislation. Unlike Cassidy, who voted to convict Trump during his 2021 Senate impeachment trial, Cornyn was a party loyalist who touted ties to the president but faced criticism for being slow to endorse Trump's 2024 re-election bid.
Texas Republicans argue that Paxton's populist message resonated with conservative voters tired of what they view as out-of-touch Washington politicians. 'This is about being too old, too timid, too aligned with the political establishment and too out-of-touch with Texas conservatives,' one Paxton surrogate said during the campaign. The party is expected to mount a strong defense of the seat in November.
What the Numbers Show
Paxton's victory represents only the second time since 1980 that at least two incumbent senators from the same party have lost primaries in a single election cycle, according to historical records reviewed by political scientists. Cornyn served in Congress for 23 years, including 12 years as Senate Republican whip and later as a member of the leadership team.
In the March first-round balloting, Cornyn finished slightly ahead of Paxton at 42.5% to 40.8%, but neither reached the 50% threshold needed to avoid a run-off. Polls have indicated a tight race in November for a state that last elected a Democrat to the Senate 38 years ago, in 1988.
The general election race is expected to draw record spending from both parties. Texas has not been considered competitive territory for Democrats at the federal level for nearly four decades, making this contest an outlier in the state's political history regardless of outcome.
The Bottom Line
Paxton's victory completes a remarkable primary season in which Trump-backed candidates have defeated sitting Republican incumbents in two Senate races within 10 days. For Democrats, the Paxton nomination represents both opportunity and risk: they believe his personal and legal controversies make him more vulnerable than Cornyn, but Texas remains historically inhospitable territory for their party in federal elections.
The November result will likely be one of the most-watched Senate contests of the cycle. If Talarico can make the race competitive, it could force Republicans to divert resources from other battleground states. If Paxton holds on, it would signal continued strength for Trump-aligned populism even over establishment Republican opposition. Either outcome will provide early indicators about Senate control heading into 2027 and 2028.