 occasionally every now and then you have a defining moment remember ronald reagan's death deflection of the question of his age in the debate against walter mondale in 1984 remember that you remember when he said he promised not to use his opponent's youth and inexperience against him even walter mondale had to laugh cnn's candy crowley fact-checking mitt romney in 2012's another one she was wrong by the way but you know those moments are really rare