The mayor-elect built the greatest field operation by any political campaign in the city’s history – by getting New Yorkers to talk to eachother. Can Democrats learn from his success?

Guardian US writer Adam Gabbatt and columnist Mehdi Hasan explore how Democratic nominee Zohran Mamdani came from nowhere to the brink of becoming mayor of New York City

Supporters say Mamdani on precipice of historic victory in New York City, but some voters say they are still undecided.