Joe Biden should watch (the film) and be like Paul Newman in "Cool Hand Luke," in Tuesday nights debate. Don't be like "angry grandpa," being too aggressive. In that case the voters will bail on him.
But due to recent events Biden might want to put a little cranky firmness in it. Biden should be cool but firm. Cool Hand Joe with a bit of outrage. He needs to keep the focus on attacking Trump / Pence. All other Dems need to tread lightly on Biden and attack if you will but it will backfire.