Well, I guess we all knew this but now it's been proven:
...children with low intelligence are more likely to hold prejudiced attitudes as adults. These findings point to a vicious cycle, according to lead researcher Gordon Hodson, a psychologist at Brock University in Ontario. Low-intelligence adults tend to gravitate toward socially conservative ideologies, the study found. Those ideologies, in turn, stress hierarchy and resistance to change, attitudes that can contribute to prejudice, Hodson wrote in an email to LiveScience.
http://news.yahoo.com/...
Of course, anyone listening to the poorly reasoned arguments of the right must be aware that you have to be pretty stupid to agree with them. Go ahead, read the whole article - they make the case better than I can.