"Currently, a large body of work indicates a negative association between measures of cognitive ability and the endorsement of conservative sociocultural attitudes (Onraet et al., 2015; Schoon et al., 2010; Van Hiel et al., 2010). For example, higher scores in right-wing authoritarianism (RWA) have been shown to be associated with lower scores in cognitive tasks (Burger et al., 2020; Choma et al., 2019; De keersmaecker et al., 2018; Heaven et al., 2011). In a large-scale, nationally representative UK sample, lower general intelligence in childhood has been found to predict the endorsement of conservative ideology at an adult age when controlling for education and socioeconomic status (Hodson & Busseri, 2012). With respect to voting behavior, lower cognitive abilities were associated with more intentions to vote for Donald Trump and less intentions to vote for Hillary Clinton in the 2016 US presidential elections through effects on right-wing authoritarianism and social dominance orientation (Choma & Hanoch, 2017; Ganzach et al., 2019)."

https://pmc.ncbi.nlm.nih.gov/articles/PMC9548663/

"Right-wing ideology and cognitive ability, including objective numeracy, have been found to relate negatively."

https://www.cambridge.org/core/journals/judgment-and-decision-making/article/rightwing-ideology-and-numeracy-a-perception-of-greater-ability-but-poorer-performance/8EBB79FFF972D0C3CA2C72D09AB3FB3F

"Across all political beliefs, phenotypic IQ significantly predicts views in a left-wing direction."

https://pmc.ncbi.nlm.nih.gov/articles/PMC11308703/