Zohran Mamdani, a 34-year-old democratic socialist, is set to become New York City mayor on January 1st, facing intense scrutiny over his promises to transform city government. Republicans label him a liberal boogeyman, while some Democrats find him too far left, and progressives watch for any shift towards the center. Political consultant George Arzt emphasizes the importance of Mamdani demonstrating his ability to govern within his first 100 days, starting with a clear agenda on inauguration day.