I agree with most of Hagrid's points, but I'll add one more: never say the 47% comment.
Yes, that is absolutely true. For the life of me, in this day and age where almost everyone twelve and over has personal recording devices, I cannot understand why any public figure, and certainly why a Presidential nominee, would think that when he is speaking to an audience that his words will remain in the room.
Following the campaign closely, it never ceased to amaze me that a man of Romney's experience, public and private, intelligence, Stanford, Harvard, business acumen, CEO, could make so many gaffes in so short a period of time. He turned out to be his own worst enemy.