When John McCain and many other Republicans ask, "Who is the real Barack Obama?" there is an implication that maybe he is somehow sinister or extremist.I don't believe that. But I do think that there are two very different Obamas. Both are extraordinarily intelligent, serene under pressure, and driven by an admirable social conscience -- albeit as willing to deploy deception as the next politician. But while the first Obama would be a well-meaning failure, the second could become a great president.