If the Democrats could get Biden elected, they would. This doesn’t mean they have any concern for him, they don’t. The key, in my opinion, is the VP selection. Once the ticket is elected, Biden’s Cabinet will wait for a time, during which all of his bizarre behavior will be documented and leaked. At the appropriate time the Cabinet, with much regret, will invoke the 25th Amendment, Biden will go home and the VP will become “Acting President.”
Biden is like Lester Eastland in “The Bad News Bears in Breaking Training,” i.e., the idiot groundskeeper whom the Bears pretend is their manager/chaperone before waving goodbye to their parents and driving off on a road trip by themselves.