It seems the way one thinks or rather how ones brain works can indicate a likely political affiliation. The main idea is how one processes risk. And, may explain why one party may not understand the other. Or, even why compromise may not occur. The evidence is supportive of how we are all biological animals. Then again, our behaviors may program how we use our brain.
Republicans and Democrats differ in the neural mechanisms activated while performing a risk-taking task. Republicans more strongly activate their right amygdala, associated with orienting attention to external cues. Democrats have higher activity in their left posterior insula, associated with perceptions of internal physiological states. This activation also borders the temporal-parietal junction, and therefore may reflect a difference in internal physiological drive as well as the perception of the internal state and drive of others.