There's actually an excellent piece... in the New York Times Magazine that explores this issue in more depth with regard to the Bush administration. The most (in)famous part is this:
QUOTE(it290 @ Oct 22, 2004 @ 11:05 PM)
However, I don't think your explanation quite works... even if it does, it's still rather troubling: it signifies that a large portion of the population is in the dark where these matters are concerned, and I for one think that is an ill omen for America's future. I find it difficult to understand how people can remain ignorant about these things when we're constantly bombarded by information from all sides.[/b]