The stark contrast between the Holywood-produced Biden and the pathetic Biden who will attempt to joust with President Trump can only help the POTUS.
Guess you never heard of a front porch campaign.
I don't think Biden will be able to run by the Fall, and I believe he will decline the nomination at the convention, but if he does run, you are crazy if you think he will be exposed to anything other than very friendly controlled media events.