Zohran Mamdani projected his impending triumph when, the morning before the election, he led a line of marchers over the Brooklyn Bridge behind a banner that read “Our Time Is Now.” The coalition of voters that lifted him to victory,

The 34-year-old’s deft use of social media, focus on affordability and a lackluster slate of other candidates propelled him to victory.

A diverse but younger-skewing crowd filled the Paramount Theater in Brooklyn with enthusiasm, dancing to hip hop and celebrating the socialist's win.

In Virginia, former U.S. Representative Abigail Spanberger, a Democrat, faces Winsome Earle-Sears, the state's Republican lieutenant governor. In New Jersey, Democratic U.S. Representative Mikie Sherrill is pitted against Republican businessman and former state lawmaker Jack Ciattarelli.

Hundreds of volunteers join the first town hall gathering hosted by Mr. Mamdani and the New York City chapter of the Democratic Socialists of America. Days later, canvassers begin field work for Mr. Mamdani, a longtime D.S.A. member who was endorsed by the local chapter.

Billionaire Bill Ackman is offering a hand to Democrat Zohran Mamdani after he was projected as the winner of New York City’s mayoral election Tuesday night.

On Tuesday, voters elected Zohran Mamdani, a Democratic socialist, as the next mayor, according to network projections. He appeared in Queens earlier in the day to vote alongside his wife, Rama Duwaji.

He has vanquished the entrenched Democratic establishment, but the new mayor can expect to face serious scrutiny in office.