After more than a year of campaigning, over $135 million in spending and an avalanche of attack ads, Texas Republicans are set to decide one of the most consequential Senate primaries in recent state history. On Tuesday, voters will choose between longtime U.S. Sen. John Cornyn and Texas Attorney General Ken Paxton in a runoff that has become a defining struggle over the direction of the Republican Party in Texas.
What began as a conventional Senate contest evolved into a broader ideological fight between the GOP establishment and the increasingly dominant MAGA wing aligned with President Donald Trump. The result could reshape Texas Republican politics for years while influencing the party’s chances in a competitive general election against Democratic nominee James Talarico.
The runoff follows a close March primary in which Cornyn captured 42% of the vote while Paxton earned 40.5%. U.S. Rep. Wesley Hunt finished third with 13.5%, preventing either frontrunner from avoiding a second round.
Although Cornyn narrowly led in the initial vote, political analysts say runoff dynamics favor Paxton. Historically, Texas runoff elections draw smaller, more ideologically conservative electorates, a trend that could benefit the attorney general and his loyal base of conservative activists.
The race intensified dramatically this week after Trump endorsed Paxton, delivering a potentially decisive boost just days before voting concludes. Trump praised Paxton’s loyalty and commitment to advancing the MAGA agenda while criticizing Cornyn for not fully supporting him during politically difficult moments.
The endorsement represented a setback for Senate Republican leadership in Washington, including Senate Majority Leader John Thune, who reportedly backed Cornyn and helped direct major financial support into the incumbent senator’s campaign.
Throughout the campaign, both candidates presented sharply different visions of Republican leadership.
Cornyn framed himself as a proven conservative capable of winning statewide in a changing political environment. His campaign emphasized electability, experience and his record of supporting Trump-aligned policies in the Senate. Cornyn also argued that nominating Paxton could put a traditionally Republican Senate seat at risk in November and force national Republicans to divert money away from other battleground states.
Paxton, meanwhile, built his candidacy around opposition to the Republican establishment. He repeatedly attacked Senate traditions such as the filibuster and argued that Cornyn represents an outdated version of the GOP that lacks urgency in advancing conservative priorities. Paxton has consistently highlighted his legal battles against the Biden administration and positioned himself as a fighter willing to challenge both Democrats and establishment Republicans.
The contest also reflects years of growing tension inside the Texas GOP.
Political observers trace the roots of the rivalry back to several defining moments in recent Republican politics. Cornyn drew criticism from Trump supporters after questioning Trump’s electability ahead of the 2024 presidential race and after helping negotiate a bipartisan gun safety bill in 2022. Paxton, on the other hand, strengthened his standing with conservative activists through his aggressive legal support for Trump and his survival after impeachment proceedings launched by members of his own party in 2023.
Many Republican strategists believe Paxton emerged from impeachment politically stronger, using the episode to solidify his reputation among grassroots conservatives as a target of establishment forces.
Financially, the race became one of the most expensive primaries in Texas history. Cornyn used his extensive donor network and Washington connections to dramatically outspend Paxton, flooding television and digital platforms with ads portraying himself as a reliable conservative and casting doubt on Paxton’s ethics and personal conduct.
Paxton countered by leaning heavily into anti-incumbent sentiment. His campaign portrayed Cornyn as a career politician disconnected from Republican voters and insufficiently committed to Trump’s agenda. The attorney general’s supporters also benefited from a series of pro-Paxton messages amplified by conservative influencers and outside political groups.
As the runoff approached, both campaigns shifted strategies.
Paxton began pivoting toward the general election after securing Trump’s endorsement. His allied super PAC launched ads highlighting the president’s backing and started targeting Talarico, signaling growing confidence within the Paxton camp.
Cornyn, meanwhile, focused intensely on turnout. Recognizing the challenges of a runoff electorate, the senator appealed not only to regular Republican primary voters but also to Texans who skipped the March election. His campaign argued that a broader turnout would favor stability, experience and character over ideological confrontation.
Early voting data has offered few clear clues about the outcome. Republican operatives monitoring turnout patterns described the electorate as largely unchanged from the March primary, with little evidence of a major surge for either candidate. Analysts noted, however, that most runoff voters are repeat primary participants, a factor that could help Paxton if his highly motivated supporters return at stronger rates.
The race has become a symbolic referendum on what Republican voters in Texas want from their leaders: an experienced conservative institution-builder or a confrontational populist aligned closely with Trump’s political movement.
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