He sold Obamacare with, "You like your insurance, you keep your insurance." Saying that once without qualification would be excusable. But hundreds of times over the past 3-4 years? Come on. Don't be dishonest with yourself. He lied. All that remains to determine now is whether he believes the NEW lie, the one where he says he never said what he did.
If be believes that's not him in the videos, then he can't be trusted with the nuclear arsenal.