Zohran Mamdani officially claimed victory in NYC's Democratic mayoral primary, securing a record 565K votes and declaring a “mandate" for his progressive agenda.

Mamdani, a 33-year-old state assemblyman representing northwest Queens, last month shocked the political establishment by trouncing the longtime front-runner, former Gov. Andrew Cuomo, whose name recognition, experience and support of billionaires and corporations, made him the favorite.