None of the three Democrats who won convincingly on Tuesday was in politics when Donald Trump was first elected President. In 2016, Abigail Spanberger , the governor-elect of Virginia, had recently left the C.I.A. and was working for an educational consultancy. Mikie Sherrill, who just won the race to be New Jersey’s next governor, was a helicopter pilot turned federal prosecutor. Zohran Mamdani, the thirty-four-year-old state assemblyman who will soon be New York City’s mayor , was rapping as Young Cardamom and volunteering for left-wing City Council candidates. For much of the past decade, the Democratic Party has seemed stuck in a pre-Trump past; Tuesday seemed like the turning of a generational page. At his victory party on Tuesday night, Mamdani, a Democratic Socialist and the mos

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