Ok, perhaps I'll be unpopular for saying this but...I just can't get past the age thing. Sure he's a healthy guy and all, but he'll be 77 when he takes office...at the most you're going to get 4 years out of him, and then running again at 81?
I'm just trying to be realistic here...my father's almost 75, none of his brothers made it to that age and we don't dance around the reality that he's only got a few years himself, he's living it up while he can.
I hope Ron Paul lives to the ripe old age of 110 as healthy as he is, but I do think the age thing would be a factor with those less faithful.
I'd still support him with all of my strength though if he runs.