Jon Huntsman appears to me as holding to the "true" Republican positions -- except his position on abortion. The traditional Republican Party position, in general, is to allow people as many freedoms as possible, promote free markets, and maintain a strong military to protect our country from foreigners. The far-right-wingers sort of hijacked the party at the beginning of Reagan's second term.
I would think Jon Huntsman would have a good chance at unseating Obama, since he would be able to attract a lot of the moderate voters.
It still amazes me that so very many Republicans honestly do not believe in the "theory" of evolution or that the earth is warming up!