Hillary is a pathetic soul who I almost can feel sorry for, but karma, like her, is a bitch.
Bill is along for the ride because, I believe, he feels he owes her. As long as he can get to engage in some perverse sexual engagement that doesn't require an erection, he's good to go.
The Roman emperor Tiberius was said to have the babies of his slaves suckle at his phallus as his last desperate attempt at erotic gratification. Bill's not quite that depraved, but then he's also not that powerful.