The election is a long way down the road. I've got mostly a good opinion of Mr. Thompson. However, I've not delved into his politics to any great degree, so it's hard to say.
And that's the same with most of the candidates - because it's so damn early in the game. I know Mrs. Clinton mostly because of her time as First Lady (less so as Senator). I mean, Obama is from Illinois and I still don't know that much about him (except that anyone from Illinois politics is bound to be corrupted somehow).
I do get a sense that he's willing to defend his ideas, and debate issues like federalism - which is near and dear to my heart. He even looks at the states as 50 experiments in government - the way I think IMHO it was meant to be. So mostly positive reaction with reservations on quality and quantity of information.