At least for 46 adult participants with strong political beliefs (would love to see that screening process!, like an opposite of jury selection??), a team of EIGHT psychologists (what a ratio for a primary study!) famously found in 2008:
Views may have a biological basis. Individuals with measurably lower physical sensitivities to sudden noises and threatening visual images (LOLWTF can you imagine the testing room?) were more likely to support foreign aid, liberal immigration policies, pacifism, and gun control. The degree to which individuals are physiologically responsive to threat appears to indicate the degree to which they advocate policies that protect the existing social structure from both external (outgroup) and internal (norm-violator) threats. - citeReactionaries, paleolibertarians and even mainstream conservatives take social hits in part because our views signal physical weaknesses -- oversensitivities. I know I am insanely sensitive to noises -- both sudden and continuing -- compared to roughly anyone else, and to what feels like danger, so this all especially rings true for me despite the total lameness of the actual study.