FWIW, the last couple of times I've come back from Europe, I've had to repressurize, so to speak, to the atmosphere of the US.
The impression I get, after having reaccustomed myself to European sensibilities and then jumping back to the States, is "Oh my God, we're a bunch of freaking hicks!"
And we are.
I mean, think about it. The great appeal of Bush was that he seemed to be no more informed or intelligent than your average Joe. He literally wore blue collar shirts with the sleeves rolled up during his campaigns ("blue collar" = "working class" here, and "rolling up your sleeves" is a metaphor for preparing to do manual labor or preparing to fist-fight).
Despite the fact that he's the pampered scion of a wealthy and powerful family, educated in the ivy league, no military service to speak of, no experience in successfully running a business, he continually lambasted his opponents as elitist rich-boys from high-falutin' schools who were disconnected from the working man. And it worked!
And this isn't unique with him. It's not unusual to see newbie politicians playing up the angle that they're not politicians and have no experience in Washington. It's like someone claiming that he'd be a better CEO than the guy in charge now because he has no experience whatsoever running a company.
America is strongly (tho not universally) anti-intellectual. Growing up, I never let kids who were not in my classes know that I made good grades. It would have been a stigma.
In Europe, my experience is that even folks who do not have formal education don't want to be seen as uninformed. Over here, knowing too much is often seen as "putting on airs", or "trying to be better than everyone else".
We also have along tradition of distrusting those in power. Our political system is built around this distrust, in fact. And that's a good thing. In fact, I'm deeply concerned about the current trend toward reversing this situation -- doing away with the notion that power is inherent with the citizen and only granted at his/her pleasure to the government -- and replacing it with a mentality of "We elect them to run the country, so shut up and let them run it".
When you combine American anti-intellectualism, distrust of power, and rather fundamentalist religous mindset, together with strong protections of free speech (which I adamantly support) and the fact that the country is so geographically large and isolated (only 2 nations on our borders) that it is not generally necessary or practical to travel outside the country or get news or books from anywhere else, you've got a breeding ground for crackpot conspiracy theories.