This talk is well worth the 18 minutes it takes to sit through it. I've quoted the summary, below, which is very brief. I really enjoy the TED talks I've watched - this one is no different.
Psychologist Jonathan Haidt studies the five moral values that form the basis of our political choices, whether we're left, right or center. In this eye-opening talk, he pinpoints the moral values that liberals and conservatives tend to honor most.