It’s a mistake. He shouldn’t do it. Dredging up the Keating Five scandal all these many years later, with the purpose of tying McCain to the GOP philosophy of deregulation, to an audience that has never heard of Keating, is foolish–and extremely risky. It is an indication that Obama has let his personal feelings get in the way of his judgment. He has built his success on being the candidate of hope and change and a new kind of politics. Why change the parameters of a race that he is winning? Yes, McCain is going to go negative. He has no choice. He’s losing. He has been attacking Obama all along. He’s still losing. There’s a saying that doing the same thing over and over, and expecting it to turn out differently is the definition of insanity. It is no less crazy to stop doing things that have been successful. The McCain camp is baiting Obama into abandoning the persona that has gotten him where he is. It looks like Obama is going to take the bait. Big mistake.