McCain supports privatization, according to his economic advisor Carly Fiorina on 4/16/08:

Well, I know that he has been very favorably inclined to the report that came out a little bit ago, the Republican party made a number of suggestions which he embraced. He has on other occasions said that he supports private accounts as one of the ways to reform the system. But I think he, and I think he will continue to be supportive of those.