Facinating:<p>&quot;Some of it is certainly genetic – estimates of the genetic contribution to political association range from 0.4 to 0.6. Heritability of one’s attitudes toward gay rights range from 0.3 to 0.5, which hilariously is a little more heritable than homosexuality itself. (for an interesting attempt to break these down into more rigorous concepts like “traditionalism”, “authoritarianism”, and “in-group favoritism” and find the genetic loading for each see here. For an attempt to trace the specific genes involved, which mostly turn out to be NMDA receptors, see here)&quot;<p>links to studies on the matter too