Democrats scored sweeping victories in three key contests on Tuesday, the first major elections since Donald Trump returned to the White House, offering the struggling party a surge of momentum ahead of next year’s congressional midterms.

In New York City, 34-year-old Zohran Mamdani, a democratic socialist, won the mayoral election, rising from a little-known state lawmaker to a leading figure in the party. In Virginia and New Jersey, Democrats Abigail Spanberger and Mikie Sherrill also won their governor races by wide margins.

The midterm elections are a year away, an eternity in the Trump era. And the contests on Tuesday all unfolded in Democratic-leaning regions that did not support Trump in last year’s presidential election.

In a sign of how Zohran Mamdani’s campaign had energized m

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