Summary (tl;dr)

Texas Attorney General Ken Paxton has won the Republican primary runoff for U.S. Senate, unseating four-term incumbent John Cornyn and setting up a closely watched general election battle against Democratic State Representative James Talarico in November 2026. Paxton's victory, bolstered by a late endorsement from Donald Trump, represents a significant shift within the Texas GOP.

Essential Background

Ken Paxton has a long and often tumultuous political career in Texas, having served as Attorney General since 2015. During his tenure, he faced multiple legal and ethical challenges, including securities fraud charges from 2015 that were ultimately dismissed in 2025 after he completed a pre-trial diversion program. Most notably, Paxton was impeached by the Texas House of Representatives in May 2023 on charges of corruption and abuse of office, but was acquitted by the Texas Senate in September 2023. Despite these controversies, he has maintained strong support from conservative voters and has been a staunch ally of former President Donald Trump. Incumbent Senator John Cornyn, a four-term Republican, had a long history of electoral success in Texas and initially led Paxton in the March 3, 2026, primary before neither candidate secured over 50% of the vote, forcing a runoff election.

The Full Story

On May 26, 2026, Ken Paxton decisively defeated John Cornyn in the Republican primary runoff for the U.S. Senate, a result that ended Cornyn's over three decades of electoral dominance and marked him as the first Texas Republican senator to lose renomination since 1970. President Donald Trump's endorsement of Paxton a week before the runoff election provided a crucial boost to his campaign. Paxton's win is seen as a triumph for the Trump-aligned wing of the Republican Party and a significant setback for the traditional GOP establishment in Texas and Washington. Paxton garnered approximately 62% of the votes in the runoff compared to Cornyn's 38%. He will now advance to the general election in November 2026, where he will face Democratic State Representative James Talarico.

Why It Matters

This primary outcome is a major indicator of Donald Trump's continued influence over the Republican Party and the preference among many GOP voters for candidates who prioritize an insurgent, anti-establishment stance, even those with significant legal controversies. Paxton's victory ensures a highly contentious general election, as Democrats, led by James Talarico, are eager to challenge Paxton, believing his history of scandals makes the seat vulnerable in November. Polls have previously shown Talarico leading both Cornyn and Paxton in hypothetical general election matchups, particularly among moderate, independent, Black, Latino, and college-educated voters. However, Texas remains a deeply red state, and Paxton enters the general election as a favorite, with the race potentially impacting the balance of power in the U.S. Senate.

Geographic Location

• Texas, United States (statewide primary runoff election for U.S. Senate)
• Austin, Travis County, Texas, United States (location of Senator John Cornyn's campaign branding on election night; State Representative James Talarico's residence; location of Ken Paxton's 2023 impeachment trial)
• Dallas, Dallas County, Texas, United States (site of Ken Paxton's victory party)
• Plano, Collin County, Texas, United States (site of Ken Paxton's victory speech)