I saw al gore described as an intj on a socionics site. I think this is possible. I think when he was denied participation in public office he went with his semi-dual energy and it was there were his analytical abilities were highlighted.
I'm always amazed at the mental abilities of the NT coupled with their great deep embodiment of humanity and I have to say I'm taking such pleasure in Al Gore recieving this award.
I think Gore is an Enneagram 1, btw. I was really struck in watching the movie by his incredible ability, all his life, to be so aware and to see him displaying his great alpha contemplation. He really gives you the feeling that your life is meaningful and that's really what we need in the world now.