DSA’s third major primary win deepens Democrats’ fight over the party’s future

The Democratic Socialists of America (DSA) are taking their political playbook nationwide. 

One week after DSA-aligned candidates scored ballot-box victories over establishment-backed contenders in two congressional primaries in New York City that grabbed outsized national attention, the group scored another major upset in a deep-blue U.S. House district in Denver, Colorado.

Democratic Rep. Diana DeGette, who was first elected to Congress in 1996 and took office in 1997, was defeated by DSA-backed Melat Kiros...