New York mayoral hopeful Zohran Mamdani was boosted by prominent US leftists at a get-out-the-vote rally Sunday, as the Democratic socialist and Donald Trump foe closed in on the city's top job.

Senator Bernie Sanders and Representative Alexandria Ocasio-Cortez spoke ahead of Mamdani, who has gone from an outsider to the unpredictable race's frontrunner -- and a standard bearer with them on the Democratic Party's left.

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