Democrat Senator Endorses NYC Mayor Candidate Van Hollen criticized Democrats for not endorsing Mamdani. He endorsed Mamdani in Iowa. Polling shows Mamdani leading at 46%. He urged Democrats to support Mamdani to prevent agenda from being sidelined Politics | Elections | Endorsements United States Zohran Mamdani | Andrew Cuomo | Chris Van Hollen | Curtis Sliwa 2 days ago