he [McCain] has single-handedly wrested the GOP from its pro-torture position, which is a huge -AS
That's just a frightening overstatement from almost any angle. McCain followed the military - particularly JAG corps. It was the military who got rid of Rumsfeld (not on this issue, but still). The GOP was torn from its pro-torture position by the Supreme Court alone, arguably. McCain has voted for legislation with enough ambiguity for the CIA to conduct ... enhanced interrogation.
At the end of the day, all that is unique to McCain is that he is visibly opposed to waterboarding, while his "friends" are not or won't say (cf. Mukasey).
Still, McCain, so far as I know, has not said anything about how his administration would pursue a Truth Commission on what occurred under the GOP's Bush-Cheney regime ...
Even if he promised anything, we couldn't take it seriously. If he was distancing himself from "torture", then why did he go to see George Bush, immediately after having secured the nomination?