I admire more Presidents than just him, but I'll say one thing, he was the only President they had to talk into taking the job, and that speaks volumes. In any position of authority it is best to begin with a little skepticism.
That being said though, I don't think President Bush is power hungry. And while I'm sure he wants to be re-elected, if he's not he'll return to 'civilian' life happy, not besotted with the thought that he no longer wields power. Clinton is just the opposite.
His desire for the Presidency should have raised everyone's suspicion merely by dint of the fact that he'd been longing for it since he was 16. That's abnormal, and he's abnormal!
Kerry has had his eye on the prize almost as long as Clinton did...scary.