Rep. Diana DeGette (D-CO), a 15-term incumbent, lost the Democratic primary for Colorado’s 1st Congressional District on Tuesday to socialist opponent Melat Kiros.

The race was the latest test of voters’ appetite for candidates who align with the Democratic Socialists of America after victories in New York City and Washington, D.C., including the ouster of Reps. Dan Goldman (D-NY) and Adriano Espaillat (D-NY).