By Joseph Ax and Maria Tsvetkova NEW YORK (Reuters) -Self-described democratic socialist Zohran Mamdani's unexpected upset in New York City's Democratic mayoral primary on Tuesday exhilarated progressive activists,

Zohran Mamdani delivered a political earthquake Tuesday in New York City’s Democratic mayoral primary, riding progressive demands for change in a city facing an affordability crisis to the brink of a stunning victory.

A fresh round of infighting erupted among Democratic officials, donors and political operatives on Wednesday, a day after Mamdani’s leading opponent, former New York Gov. Andrew Cuomo, conceded the Democratic primary. Mamdani appears on a glide path to the nomination, though ranked choice vote counting will determine the final outcome next week.