It's neither amnesia nor dementia......it sheer stupidity with a touch of idiocy.
Jimmy Carter claimed to be a great Christian, and his brother, Billy, was supposed to be the reprobate, but actually, he was far more honest about who and what he was than Jimmy ever dared to be. If Jimmy Carter had been the man he claimed to be, he wouldn't be the petty, deceitful, and mean spirited man he is today.