Unlike John Insane, Biden didn't show up the next morning and claim he'd really been talking about Herbert Hoover. Or he meant the Bank Holiday in 1933, not the Stock Market crash of 1929.
McCain lies like a trooper. Says the dumbest fucking thing and then tries to weasel out of it when his stupidity is exposed by claiming he meant something entirely different. So he ends up looking like a moron AND a liar. Which is OK after all, because that's exactly what he is.