I would say he's an old geezer who had a geezer moment, which is undoubtedly true. But I don't ignore Dementia Joe when he has his multiple and frequent geezer moments, so no need to start with Mitch the Turtle.
He's done at least one good thing, which is kill that feckless waste of carbon Merrick Garland's shot at being on the SCOTUS. Good job Mush Mouth Mitch!