This new study says that the more TV news you watched about Irag, the less you understand about the war. That's especially true if you watched Fox News. The most intriguing paragraph is the last one:

Among Bush supporters, those who said they follow the news "very closely", were found more likely to hold misperceptions. Those Bush supporters, on the other hand, who say they follow the news "somewhat closely" or "not closely at all" held fewer misperceptions. Conversely, those Democratic supporters who said they did not follow the news very closely were found to be twice as likely to hold misperceptions as those who said they did ... .

There may be methodological problems here, but it's consistent with other studies I've seen that have found a negative correlation between how much TV news people watch and how well they understand the world. I don't have enough Goggle time to track those down for you today -- except for one that showed how TV influences perceptions of how dangerous the world is. And, darn it, I've misplaced that link already.