The Mercury News has an interesting survey of impression people have about the Iraq war, cross-referenced by their self-identified main news source:
Oh yes, we have a liberal media hostile to the Bush administration and attacking the Iraq policy at every turn.
I’d guess that the main reason for the disparate results between Fox and the other networks is self-selection: Fox viewers are more likely to be Republican and thus predisposed to believe the representations of a Republican president. And, of course, only a third of Fox viewers think we’ve found WMD. My guess is a substantial proportion of them are thinking of various reports that came out in March indicating that we had indeed found various stashes that turned out to be erroneous.