The democratic socialist Melat Kiros unseated the long-serving US representative Diana DeGette in Colorado’s primary elections held on Tuesday, the latest in a string of high-profile victories for the party’s insurgent left.

The Associated Press reported that Kiros had defeated DeGette for the Democratic nomination in the deep-blue first congressional district centered on Denver. Kiros’s triumph came a week after New York voters unseated two Democratic congressional incumbents and replaced a third who was retiring with candidates who had campaigned on standing up to Israel amid accusations that it was carrying out a genocide in Gaza.