As the youngest man in more than a century to become New York City mayor prepares to take office, his aides, advisers, supporters and would-be staffers are looking at the lessons of the past.

Among them are the triumphs and mistakes of another Democratic legislator swept into high office by an insurgent, youth-driven movement clamoring for a new political dawn: Barack Obama .

Senior advisers and aides who worked in Obama's orbit before he was president and during his eight years in the White House are among those counseling Mayor-elect Zohran Mamdani, 34, who takes office in 46 days.

Obama himself and Mamdani have repeatedly spoken in recent months, with Obama offering to be a "sounding board," as Mamdani translates his platform into policy for universal child care, municipal gro

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