Who is the most sane Republican candidate?

I think that if either Gingrich or Cain were "insane" they certainly wouldn't be able to hold jobs as the Speaker of the House or as a CEO and if Bachmann and Palin were "morons" how did Bachmann pass the bar, become a successful tax attorney and win election 3 times and how did Palin become a very successful woman with a 90% approval rating as governor?