Zohran Mamdani declared victory in New York City’s Democratic mayoral primary Tuesday night after Andrew Cuomo conceded the race in a stunning upset, as the young, progressive upstart who was virtually unknown when the contest began built a substantial lead over the more experienced but scandal-scarred former governor.

Mamdani, 33, a two-term Queens assemblyman, replicated on a citywide scale what fellow socialist Rep. Alexandria Ocasio-Cortez accomplished in one congressional district when she toppled former Congressman Joe Crowley in the 2018 Democratic primary, with a new coalition that included younger voters.

Cuomo, who long led polls in the Democratic primary, conceded Tuesday night before vote-counting was even finished.