Watch the Gore movie some day when you're feeling virtuous. Though some people knocked it and said it's just a slide lecture, it's a hell of a slide lecture, like one you've never seen, and he puts a lot of himself into it.
One has to be skeptical about any politician. No matter how good they are, circumstances are set up to defeat their best impulses. And some of their impulses are none too good to begin with. Politics is all kinds of indigestible reality sandwich. It's the toughest test of all. Nobody really passes it 100% -- except th armchair second-guessers.