WASHINGTON: The anti-establishment left of the Democratic Party has carried a surge of US primary victories from New York to Colorado, delivering a stinging rebuke to party leaders seen as too cautious, too corporate and too tied to Washington. In its latest triumph, Democratic Socialist Melat Kiros, a 29-year-old former attorney and part-time barista, stunned one of the party’s longest-serving lawmakers Tuesday, defeating Diana DeGette in a Denver-based House district.

A House race in the blue stronghold of Denver has quickly become the next test of Democrats’ appetite for socialism.

Colorado's primary has Democratic incumbents fighting off challenges ranging from progressive newcomers to state lawmakers seeking higher office.