What follows is an excerpt from a study about how racism and conservatism are tied to stupidity:
The research finds that 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.
As proof of this study, I offer this campaign ad for Florida Republican Mark Oxner, from Wonkette, which is really the Gone with the Wind of stupidity: