Alexandria Ocasio-Cortez, 28, defeated political veteran Joe Crowley,
56, on Tuesday night in their party's congressional primary in New York
Mr Crowley, a 10-term Democrat, had been tipped as a future party leader or even Speaker of the House.
Ms Ocasio-Cortez, a former Bernie Sanders volunteer from a Puerto Rican family, won with 57.5% of the vote.
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