Not sure where you're getting that. Nowhere in the piece do I say there has never been a democratic socialist mayor anywhere in America. Nowhere do I say it's untested. The paragraph you quote from is literally about the electoral successes of DSA members.

Right, but La Guardia wasn't a socialist as mayor, and ran against a series of socialist candidates. (Vito Marcantonio, otoh…).

As for Dinkins, that's fair to note that he was a DSA member. But he didn't embrace the label in his 1989 election in the way that Mamdani has.

Not sure what you're taking issue with here? The mayoralty of New York City is indisputably a considerably bigger office than that of, say, Cudahy, California.

Thank you so much for reading!