It has been hypothesized online that people of low and high intelligence tend to agree on some issues, while those of average intelligence have a different opinion. To my knowledge, the only person who has tested this quantitatively before me and Emil took over the field was Noah Carl, who found some limited support for midwit theory favoring left wing beliefs in the GSS. Within this dataset, he found that the most socially liberal decline was always the 10th decline of cognitive ability, while the most fiscally conservative decline was usually around the upper average.