This article in the WSJ is an excellent read. A short excerpt:
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All these comments were easily available on the Internet, yet they were seldom mentioned in the news coverage of Mrs. Sheehan's protest. They didn't fit the script--a script in which Mrs. Sheehan was playing the role of an ordinary American whose personal tragedy had turned her against the war.
Where did this script come from? Howard Fineman of Newsweek got at it in a provocative essay he wrote in January 2005, after CBS News released the findings of its independent investigation of the phony "60 Minutes" story about President Bush's National Guard service. Mr. Fineman argued that the journalistic establishment had, in effect, transformed itself into a political party; he called it the American Mainstream Media Party, or AMMP. "The notion of a neutral, non-partisan mainstream press," Mr. Fineman wrote, was "pretty much dead":
The seeds of its demise were sown with the best of intentions in the late 1960s, when the AMMP was founded . . . (ironically enough) by CBS. Old folks may remember the moment: Walter Cronkite stepped from behind the podium of presumed objectivity to become an outright foe of the war in Vietnam. Later, he and CBS's star White House reporter, Dan Rather, went to painstaking lengths to make Watergate understandable to viewers, which helped seal Richard Nixon's fate as the first president to resign. The crusades of Vietnam and Watergate seemed like a good idea at the time, even a noble one, not only to the press but perhaps to a majority of Americans. The problem was that, once the AMMP declared its existence by taking sides, there was no going back. A party was born.
CNN said it was because of the banner that she unfolded. Could that be a folded banner in her hand?