Zohran Mamdani’s victory in the New York City mayoral race is more than an improbable municipal election win; it is a template for Democratic revival, one that can marry socioeconomic policies and message discipline to unambiguous moral clarity. I first interviewed Mamdani shortly after Donald Trump’s victory over Kamala Harris left the Democratic Party in tatters. Already a declared candidate, the unabashed democratic socialist spoke with hyperfixation on affordability and the need to reorient the Democratic Party away from Wall Street and toward the working class. I interviewed Mamdani multiple times over the next year, including amid a surge of...