Who could replace Joe Biden? Here are six possibilities
Briefly

There is no formal mechanism to replace him [Biden] as the presumptive nominee, and such a move would be the first time a US political party has attempted to do so in modern times.
If a candidate were to be chosen at the Chicago convention that would make what is conventionally a highly choreographed event, where a party presents its nominee to the public over several days, into a much more volatile open, or contested, convention - a rarity in modern US politics.
Read at www.theguardian.com
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