In this case, the campaign is objecting to a statement by NBC's Andrea Mitchell on "Meet the Press" questioning whether McCain might have gotten a heads-up on some of the questions that were asked of Sen. Barack Obama (D-Ill.), who was the first candidate to be interviewed Saturday night by Pastor Rick Warren at a presidential forum on faith.

Warren told the audience that McCain was being held in "a cone of silence" so he wouldn't hear the questions, which were similar for both candidates.

Warren referred again to "the cone of silence" when McCain came onstage, and the senator joked: "I was trying to hear through the wall."

Mitchell reported that some "Obama people" were suggesting "that McCain may not have been in the cone of silence and may have had some ability to overhear what the questions were to Obama. He seemed so well prepared."

A McCain aide said that is not the case: "Senator McCain was in a motorcade led by the United States Secret Service and held in a green room with no broadcast feed."

Mitchell made the comment in the context of saying McCain did better, and that the Obama camp was defensive. In response to the campaign's letter, she pointed out that journalists get criticism from both sides.

"I wasn't expressing an opinion," Mitchell said. "I was reporting what they were saying."