OKAY BUT WHO SPECIFICALLY? that's the whole fucking problem, everybody wishes the nominee was someone else but nobody can NAME THAT PERSON or agree on who it should be. we had a whole fucking primary about this 4 years ago, everybody knew it was going to be an issue this year and the majority STILL PICKED BIDEN so if you wanted "a vigorous Democratic leader" - if one even EXISTS - you should have fucking nominated them 4 years ago!
yes, let's replace the most accomplished Democratic incumbent in a generation with a candidate even more reviled than Hillary Clinton, that will secure a win against Trump. we literally already considered this matchup 5 years ago and she got so little support that she dropped out before primary voting even started. she never passed double digits in the polls and her only success was helping snipe Warren's campaign at its peak.
... although if that's the worst Republicans can say about a Black woman who has utterly squandered her time as the most powerful woman in the history of American government, maybe that's a good sign...