Zohran Mamdani, a 33-year-old state assembly member and democratic socialist, is on the verge of a major upset in the race to be New York City’s next mayor. Former New York governor Andrew M. Cuomo conceded the Democratic primary on Tuesday night,

Voters in the Democratic mayoral primaries are able to rank their top five candidates, but are not required to fill all five slots. If a candidate gets over 50% first-choice votes, they win. But if not, the candidate with the fewest votes is eliminated as votes are counted in subsequent rounds.