The numbers behind Zohran Mamdani’s upset performance over former Gov. Andrew Cuomo in New York City's Democratic mayoral primary.

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

With victory all but assured, Mamdani, a 33-year-old democratic socialist who ran an energetic campaign centered on the cost of living, told supporters, "I will be your Democratic nominee for the mayor of New York City.