Since the re-election of Donald Trump last November, a demoralised Democratic party has struggled to reverse a palpable sense of downward momentum. At a grassroots level, amid plunging poll ratings, there has been a yearning for renewal and a more punchy, combative approach in opposition. Against that bleak backdrop, the remarkable election of Zohran Mamdani to the New York City mayoralty is a moment for progressives to savour.

Mr Mamdani entered the mayoral race last October as a socialist outsider with almost zero name recognition. He won it with more than 50% of the vote after the highest turnout in more than half a century, and despite the best efforts of billionaires to bankroll his chief rival, the former New York governor Andrew Cuomo,........

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