This is the biggest thing. If he were to actually tell the full truth here, he’d be less successful in getting his message across to the people who listen to him. Full truth is the ultimate goal, but we’re so far from it that for half the country it’s an impossibly huge leap to go from where they are now to the truth in one bound.
While that’s true, it was mostly just because Mondale was from Minnesota, and even then he only won by 0.18%.