The source of a discredited CBS News report said Thursday that he did not coordinate the release of disputed documents with John Kerry's campaign. Bill Burkett, a former Texas National Guardsman, also said that he warned the network that the documents critical of President Bush's service in the National Guard would be vigorously challenged and should be independently validated. "It caught CBS very flat-footed. They were not prepared. And I had warned them ... that this would probably be one of the most highly coordinated vicious attacks that they would ever have to face," Burkett said in an interview with...