Just after the New Year’s Eve ball dropped in Times Square, Zohran Mamdani took the oath of office on a Quran in a defunct subway station under City Hall to become the 112th mayor of New York City. The 34-year-old instantly made history as the city’s first Muslim, first Asian American and first millennial mayor. Hopefully, he’ll be remembered for more than just those things.

Mamdani’s improbable ascent was in large part thanks to a comprehensive campaign that combined viral video content with a rigorous volunteer program. In a lengthy New York magazine profile, Mamdani has expressed his inclination to........

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