Rep. Diana DeGette, D‑Colo., a 30-year incumbent, lost to a Democratic Socialists of America (DSA)-backed challenger in a high-profile primary on Tuesday evening.Melat Kiros, a 29-year-old socialist, defeated DeGette in a Democratic primary for a deep-blue House seat anchored in Denver, according to The Associated Press, scoring a major victory for the socialist left on Tuesday evening.The DSA had been aiming to cast DeGette’s loss as evidence of its growing momentum after a slate of socialist candidates won Democratic primaries in New York City last week.“Today, the East Coast, next week the Mountain West,” the DSA wrote in a social media post last week.SOCIALISTS CHEER ‘SHOCKWAVE’ PRIMARY NIGHT AS DSA-BACKED CANDIDATES WIN, ADVANCE ACROSS THE MAPIf elected in November, Kiros, who was born in Ethiopia, will likely join the ranks of the far-left group known as the Squad and be …