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.

New York State Assembly member Zohran Mamdani was way ahead after ballots were counted last week, but the city’s ranked choice system meant he could not clinch the nomination until second-choice votes were counted Tuesday.

Zohran Mamdani would give Republicans a far-left figure on a big stage — as the mayor of nation’s largest city and media capital — on which to focus their criticism. Everything Republicans see as