Here are some of the factors that drove Zohran Mamdani to the cusp of a seismic upset, and how they will affect the general election in November.

He was 30 points behind former governor Andrew Cuomo just months ago, but now he’s surging in the contest to lead the largest US city

Despite a massive cash advantage and the backing of many establishment Democrats, former Gov. Andrew Cuomo conceded a stunning defeat at the hands of a left-wing newcomer.