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Story summary
- The 2026 primary cycle has produced a wave of incumbent defeats across both parties.
- Incumbent Diana DeGette lost renomination to challenger Melat Kiros in Colorado’s 1st District primary on July 1, 2026.
- U.S. President Donald Trump’s endorsements helped unseat Rep. Thomas Massie, Sen. Bill Cassidy, Sen. John Cornyn and Rep. Dan Crenshaw in primaries.
- So far seven House members and two Republican senators have been defeated in primaries this year.
