I really wish StratPage would include links to the numerous studies they quote.   This one in particular is one I'd love to get a peak under the covers at -

During the month of fighting that led to the fall of Baghdad, 51 percent of the U.S. network news stories were negative. By late 2003, nearly 80 percent were negative. During the 2004 Presidential elections, 89 percent were negative, and by 2006, over 90 percent were negative. This despite a long string of additional victories. The media became increasingly reluctant to interview the troops, because they told a story that was quite different from what the TV news media was spinning.