For the life of me, I cannot figure out why anyone would want to be president. Sure, even if you do a lousy job (maybe especially if you do a lousy job) you get your picture in the history books.
Still, If you think about it, it's really just a glorified temp job and the whole country is your janus-headed supervisor.
You say, "But you get to be leader of the free world!" I say "leader" is probably too strong a term. At best you're a cat-herder and half of the cats aren't going to do what you say no matter what just because you vote blue and they vote red or vice versa.
Who needs that kind of aggravation?