Mr. Mamdani roundly defeated Andrew M. Cuomo in the Democratic contest, widening his primary-night lead by a significant margin once ranked-choice tabulations were run.

Zohran Mamdani has won New York City’s Democratic mayoral primary. A new vote count Tuesday under the city’s ranked choice voting system confirmed the progressive legislator’s stunning upset of former Gov.

Democratic mayoral candidate Zohran Mamdani could clinch victory Tuesday when the New York City Board of Elections releases the first look at the ranked-choice voting results from the June 24 primary.