Jonathan Haidt is an Associate Professor of Psychology at the University of Virginia. Recently, he looked into the link between moral gut feelings and political voting behaviors. His results were interesting, especially for those who claim to make political decision based solely on logic and reason. Here is a snippet from his article (link to full-text below)
First, when gut feelings are present, dispassionate reasoning is rare. In fact, many people struggled to fabricate harmful consequences that could justify their gut-based condemnation. I often had to correct people when they said things like “it’s wrong because… um…eating dog meat would make you sick” or “it’s wrong to use the flag because… um… the rags might clog the toilet.” These obviously post-hoc rationalizations illustrate the philosopher David Hume’s dictum that reason is “the slave of the passions, and can pretend to no other office than to serve and obey them.” This is the first rule of moral psychology: feelings come first and tilt the mental playing field on which reasons and arguments compete. If people want to reach a conclusion, they can usually find a way to do so. The Democrats have historically failed to grasp this rule, choosing uninspiring and aloof candidates who thought that policy arguments were forms of persuasion.