Nope. And none of the Democrats will do so either.
If Biden has the delegates, he's in.They don't care if he's become a blithering idiot. They just want to get him in. Then a year or so into his term, they'll retire him and bring in the VP. Remember how they were bringing in all these doctors who claimed Trump was dangerously incompetent? Funny eh?
I think they're talking 25th Amendment already. And don't be surprised if the main obstacle is Jill Biden, aiming to be Edith Wilson.