[airborne]

If Joe croaks after picking his VP but before the election does the VP become the Presidential candidate?

[hanamizu]

If Joe croaks after picking his VP but before the election does the VP become the Presidential candidate?

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Not necessarily. It would all depend on the democrat party rules, which, of course are subject to change at short notice. If Biden, God forbid, were to be elected and die before inauguration, the VP-elect would become President.