Haidt's hope is that by understanding how our moral roots evolved, and why they evolved as they did, we can learn to be more civil in our discourse, and understanding of the passions that drive us all. As he sums up, "our Righteous Minds were 'designed' to (a) unite us into teams; (b) divide us against other teams; and (c) blind us to the truth." I find what he has to say especially fascinating in light of the "Manhattan Declaration" being introduced today.
You may take Jonathan Haidt's quizzes (there are quite a few) to determine your own moral spectrum at this link. (You will need to register, but that will then allow the site to retain your scores to compare when you revisit to take more quizzes, or to compare with family and friends. Privacy is guaranteed.) He also has a site called "Civil Politics", where he urges us to practice what he preaches; and you may read here an interview in which he applies his ideas to the current healthcare debate. There is more about him here, with links to the books he has written, as well as to his pages at the University of Virginia, where you will find a concise summary of the ideas he espouses in the talk shown above. You may download the talk from this page.