I couldn't find one by just Dylan, but I found this one with Dylan and Cash. (It is a "working" version, where it sounds like they were still working on the lyrics.)
That's a great idea. Biden might even take him up on the offer, so he doesn't have to stand for over an hour.
Many people believe that they will be "jacking up" Joe with some kind of stimulant shots, so that he will appear minimally senile, but I wonder if those drugs will make it difficult for him to either stand there or sit there for the whole debate.