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I don't think that's the right explanation. Trump aside, how did a dumb, unpopular stool become the Democratic nominee? She was appointed. Biden won the primary, then he was ousted, and the entire timeline of what happened shows it was a coup. Harris is a creature of the Deep State and if voters don't understand this then they are being fooled.
Well, Biden won the nomination, or rather... presidents who are finishing their first term usually go and try to get their second term unchallenged, hence why their party does not hold primaries in any significant way, unlike the opposing party which holds primaries.
Biden was pressured not to continue to seek for his second term, he was definitely talked out of it by Obama, Clinton and other important people within the party. Some people who sympathize with Trump from the beginning would have rather argued Joe Biden has always been a Deep state creature, by the way.
Considering we are talking about his Vice-president, I have seen people making the case Kamala Harris is the most democratic option, as she is the closest one can get to Joe Biden in terms on governance and policies.
Though, it is true, I would have preferred to see someone completely different on the democrat ticket than her, perhaps someone younger...