John R. Hibbing

TL;DR: The authors combine relevant findings in behavioral genetics with their own analysis of data on a large sample of twins to test the hypothesis that, contrary to the assumptions embedded in political science research, political attitudes have genetic as well as environmental causes.

TL;DR: Evidence that variations in political attitudes correlate with physiological traits is presented, suggesting that individuals with measurably lower physical sensitivities to sudden noises and threatening visual images were more likely to support foreign aid, liberal immigration policies, pacifism, and gun control.

TL;DR: It is demonstrated that individuals with marked involuntary physiological responses to disgusting images, such as of a man eating a large mouthful of writhing worms, are more likely to self-identify as conservative and, especially, to oppose gay marriage than are individuals with more muted physiological response to the same images.

TL;DR: This article investigated the degree of concordance among spouses on a variety of personality traits and found that physical and personality traits display only weakly positive and frequently insignificant correlations across spouses, whereas political attitudes display interspousal correlations that are among the strongest of all social and biometric traits.

TL;DR: This paper found that genetic influences account for an even greater proportion of individual differences than reported by studies using more limited data and more elementary estimation techniques, making it increasingly difficult to deny that genetics plays a role in the formation of political and social attitudes.