Can progressive mayors save the Democratic Party?

New York City’s mayor-elect Zohran Mamdani built a coalition of voters who were engaged by his charisma and his campaign’s focus on key issues such as affordable transportation, housing and childcare. Mamdani has pointed to Boston mayor Michelle Wu, who was just re-elected in a landslide herself, as inspiration and for being “the most effective Democrat in America.” What can be learned from how progressive mayors like Wu and Mamdani are energizing voters?