Mr. Mamdani, who exploded onto the national political scene after besting incumbent Mayor Eric Adams and former New York Gov. Andrew Cuomo in the city’s June Democratic primary, is widely expected to win the general election on Tuesday. Most polls have him leading Mr. Cuomo, who is now running as an independent, and Republican nominee Curtis Sliwa by double digits. (Mr. Adams, who was also running as an independent, dropped out of the race in September.) A three-term state legislator who identifies as a democratic socialist, Mr. Mamdani has electrified young people and left-leaning voters with an affordability-centered campaign that promises to freeze rents for rent-stabilized apartments, make city buses free, and provide free childcare for all New York City children between the ages of 6 weeks and 5 years. He says he would pay for these programs by raising taxes on corporations and the wealthy.