Harris was shitcanned post haste when she actually primaried, so the party already knew she was non-viable. She got put in as VP as the best token non-white woman from a large population state they could shove in there and then Democrats got caught with their pants down because they hid Biden's physical state past the point they could have an actual primary to vet the proper candidate.

The fact Biden said he wouldn't back out then suddenly did at the 11th hour made the whole thing far more bizarre and was a massive erosion of confidence in any semblance of a plan for the presidency by the Democratic Party. I ended up voting for a 3rd party because both campaigns were run so horribly to the point I couldn't even imagine either side managing a mayor's office let alone the country.