Senator John Cornyn’s significant loss in the primary runoff underscores the ongoing shift among ardent Republican voters. These voters have increasingly distanced themselves from established party figures, aligning with President Trump’s preferences over the last decade.
This year, Trump’s core supporters have continued to impact Republican primaries significantly. They have contributed to his record of replacing incumbents like Cornyn, whom Trump labels as disloyal. Although Trump’s popularity with the broader electorate has decreased, his success in primaries has created a more favorable situation for Democrats in upcoming midterm elections.
Despite being a four-term senator and once a key Republican figure, Cornyn was defeated by Ken Paxton, a MAGA-aligned challenger, by an impressive 28 percentage points. Paxton’s victory was noteworthy, given the financial disparity in what was the costliest Senate primary in history. According to Decision Desk HQ, this marks the worst performance for an incumbent senator in such a race since 1974.
Cornyn’s loss comes shortly after Senator Bill Cassidy of Louisiana, also opposed by Trump, failed to reach a runoff in a four-candidate race, securing under 25% of the vote. These losses highlight the substantial distance between the party’s primary electorate and any GOP leader not endorsed by Trump.
Recently, Trump played a role in defeating another critic, Representative Thomas Massie of Kentucky, in a House primary on May 19. Earlier that day, Trump remarked, “It’s not easy beating incumbents.”

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