In a significant upset, Texas Attorney General Ken Paxton (R) is projected to defeat incumbent Senator John Cornyn (R-Texas) in the Republican runoff for Senate, aided by a last-minute endorsement from former President Donald Trump. This outcome ends Cornyn's bid for a fifth term in the Senate and sets up a challenging general election against Democrat James Talarico. Trump's endorsement, which came just as early voting commenced, marked a notable departure from the Senate leadership's support for Cornyn. The runoff became the most expensive primary in Texas history, with substantial funding anticipated as Democrats target Paxton, who is viewed as a vulnerable candidate due to past scandals, including a recent impeachment. Polls show a competitive landscape, with Talarico leading in some surveys against both candidates. As the general election approaches, Republicans are still favored to retain the seat, but Talarico's campaign has drawn comparisons to Beto O’Rourke’s close race against Senator Ted Cruz in 2018, indicating a potentially tight contest ahead.