Marxist streamer Hasan Piker has emerged as an increasingly visible, if unofficial, spokesman for the Democratic Socialists of America's rapidly expanding political action network. He campaigned for Michigan Democratic Senate candidate Abdul El-Sayed and Wisconsin gubernatorial candidate Francesca Hong while cultivating close ties with socialist New York City Mayor Zohran Mamdani.

From an electoral-risk perspective, Piker is becoming a liability for Democrats. His far-left, anti-American rhetoric provides Republicans with what we called "a gift" last week. Even Hillary Clinton warned on Friday that the GOP's "anti-communist messaging is very effective."

The Democratic Party's failure to formally denounce Piker and distance itself from his agenda...