" Leadership doesn't end with a single campaign." That was Rudy Giuliani tonight. Mark Halperin has reported that Rudy Giuliani will endorse McCain as early as Wednesday. I think he's right, but the McCain team would prefer to have Giuliani at the debate in California. They believe Giuliani, who doesn't like Mitt Romney, will help deflect Romney's attacks on McCain. On the bus on Sunday, McCain talked about his friendship with Giuliani. He said that it would be inappropriate to talk at length about a potential Giuliani endorsement of his candidacy, but noted that he and his wife, Cindy, are friends with top Giuliani adviser Tony Carbonetti and his wife. Carbonetti's wife, Carol, stayed with the McCain's at their home in Lake Powell a few years back.