This won't detain us long. It's an abstract of an article by former Yugoslav psychologist Lazar Stankov. Considering its poor quality and dogmatic conclusion, it is rather a surprise that it got published in Intelligence (37, 2009, 294–304), which is a respectable academic journal.
Conservatism and cognitive ability
Conservatism and cognitive ability are negatively correlated. The evidence is based on 1254 community college students and 1600 foreign students seeking entry to United States' universities. At the individual level of analysis, conservatism scores correlate negatively with SAT, Vocabulary, and Analogy test scores. At the national level of analysis, conservatism scores correlate negatively with measures of education (e.g., gross enrollment at primary, secondary, and tertiary levels) and performance on mathematics and reading assessments from the PISA (Programme for International Student Assessment) project. They also correlate with components of the Failed States Index and several other measures of economic and political development of nations. Conservatism scores have higher correlations with economic and political measures than estimated IQ scores.
The "sample" is of course laughable and provides no basis for generalizing to any known population. Its representativeness is unknown. If the findings suggest any inferences at all, they may tell us that only dumb conservatives need to go to community colleges but even some smart Leftists need to, perhaps because they were less conscientious during their high school studies.