On Tuesday New Yorkers elected socialist and Democratic Party candidate Zohran Mamdani as mayor. Mamdani, the city's first Muslim and African-born mayor and the youngest in over a century, was harshly criticised by President Donald Trump throughout the campaign.

But his win, along with the election of several other Democrats in races across the country, has forced Trump to start taking seriously the threat of a Democratic resurgence in next year's midterm elections. And Democrats are starting to feel hopeful, even if Mamdani's election poses questions about what the party has become and exactly how it should take on Trump.

Keith Duggan reports from Washington.

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