Democratic voters in Wyoming are believed to be switching party affiliation to help Ms. Cheney, the most staunchly anti-Trump Republican running for reelection this year, win a tough primary contest.
“Wyoming politics is very personal. It’s face to face, it’s town to town,” Mr. Barrasso said. “The travel that I have done around the state, I think she has a lot of work to do if she hopes to win the primary.”
Mr. Trump endorsed her lead challenger, Harriet Hageman, who is seeking to oust the congresswoman from her Wyoming single House district.
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