Zohran Mamdani was poised to deliver a stunning upset in New York City’s mayoral primary that pitted youthful enthusiasm against Andrew Cuomo’s billionaire backers, union endorsements and old-guard Democratic support.

State Assemblyman Zohran Mamdani is the leader as first-choice votes are tallied in the New York City Democratic mayoral primary, ahead of former New York Gov. Andrew Cuomo, who declared his rival the winner even though no candidate is set to secure a majority in the first round of the ranked choice election.

Cuomo’s concession came as the race’s outcome will be decided by a ranked choice count after neither Democrat got a clear majority.