Democrats are infighting after losing the Presidential election, after forcing Biden out, and them pushing Kamala Harris as a replacement. Why?

I can't believe that Democrats thought that Harris would be successful as a Presidential candidate to oppose Trump? Does that make any sense, and did they not have anyone else to put up to run... or were they just desperate?

What do you think?

Democrats are infighting after losing the Presidential election, after forcing Biden out, and them pushing Kamala Harris as a replacement. Why?
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