Some establishment Democrats have been uneasy about the 33-year-old's left-wing platform.

At an annual fund-raiser in Iowa, the Maryland Democrat said he supported Zohran Mamdani for mayor of New York City and said people were sick of “spineless politics.”

I am confident that Zohran Mamdani has the courage, urgency, and optimism New York City needs to lead it through the challenges of this moment.