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.

Upstart democratic socialist Zohran Mamdani clinched the Democratic nomination for mayor of New York City, extending his lead to 12 points in the primary over Andrew Cuomo and raising new doubts about the viability of the former governor running as a third-party candidate.