Lombardi quit law school after one semester.
And I didn't. But, I'm not a football coach, and Lombardi's not a lawyer. But, Palin is a politician. She quit the only elected office that may have qualified her to run for the presidency. And, she didn't leave office because she was taking a promotion, as so many other do. She left because the heat was too much to bear.
If the heat in the Alaska governor's office makes her quit, what would the heat of the most widely and passionately criticized office in the world do to her? The White House is no place for shrinking violets, no matter who the or what the current occupant is.