Joe Biden has endorsed Kamala Harris for US president. What happens next?
Briefly

Biden's decision to withdraw is not merely unusual – it is unprecedented in modern US politics. 'We're in uncharted territory here,' said Kyle Kondik, managing editor for Sabato's Crystal Ball.
While Vice President Kamala Harris is an early favorite to replace Biden, challengers could emerge. The new nominee will be chosen at the Democratic National Convention next month.
Biden's withdrawal presents a unique situation as he won most pledged delegates and quit after primaries, becoming the first presumptive nominee of a major party to do so.
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