100%
Look - if Booker were polling at 70% instead of 40, I'd say "make your move today and get fully behind the man."
He's not, no one is - virtually every possible replacement is polling worse than Joe and within the margin of error. Saying simply that Biden can't win and we might have a chance with someone (not named) else is just full on bat shit crazy.
It's like that saying in the NFL, "if you have 2 quarterbacks, you have none".
We have our quarterback, his name is Joe Biden, and we all stand behind him together. Just because he threw an interception at the start of the 4th quarter in the super bowl, doesn't mean you yank him and then start looking for a replacement. Fkn democrats would squabble for a year to reach a consensus on a replacement candidate - and (realistically) it's too late already.