Lower Cognitive Ability Predicts Greater Prejudice

http://pss.sagepub.com/content/23/2/187.abstract

"lower general intelligence in childhood predicts greater racism in adulthood, and this effect was largely mediated via conservative ideology. A secondary analysis of a U.S. data set confirmed a predictive effect of poor abstract-reasoning skills on antihomosexual prejudice, a relation partially mediated by both authoritarianism and low levels of intergroup contact. All analyses controlled for education and socioeconomic status."