Psychopathy and IQ
Leftists such as the Clintons have a lot of psychopathic traits and it is clear that most psychopaths don't get into trouble with the law and can be fairly successful in business and politics. So it is a condition that we do well to know about.
Because of some prominent examples of psychopaths who have high IQs, there has developed an impression that psychopaths are generally of above average IQ. It is always unsafe to generalize from a few examples, however, so a paper that looks at a full range of the evidence on the subject is very welcome. And the finding (see below) is that ON AVERAGE, psychopaths are in fact a bit dim.
There is a fuller discussion of the matter here
On the relationship between psychopathy and general intelligence: A meta-analytic review
Olga Sanchez de Ribera et al.
Over recent decades, a growing body of research has accumulated concerning the relationship between indicators of general intelligence and the personality construct known as psychopathy. Both traits represent key correlates of life outcomes, predicting everything from occupational and economic success, to various indicators of prosocial behavior (including avoiding contact with the criminal justice system). The findings to date regarding the association of the two traits, however, have been somewhat inconsistent. Thus, there remains a need for a more systematic investigation of the extant empirical literature. The current study reports a meta-analysis conducted to evaluate the direction and overall effect size of the relationship between these two constructs. Our analyses revealed a small, but significant, negative effect of intelligence on psychopathy. The results and impact of possible moderating variables such as type of intelligence test used are discussed. Finally, the study limitations, and possible directions for further research on this issue are detailed prior to concluding.