so i said to him after a few months of some embarrassment, you know, it is cass sunstein. you can call me cass or mr. som. sunstein. he looked at me and said that's unbelievable. that's amazing. you look exactly like mr. power. [laughter] that was intriguing to me in the sense that he was not an irrational person. he was out dating basically his beliefs based on the new information. and he believed it was more likely that there were two people who looked exactly the same walking around this building, then that the ambassador's husband had a different name from her. and given his prior belief, that was not irrational. it turns out to be wrong. but it was not irrational. okay. here's the united states of america in many respects today. when people are asserting their correctness. this is the capacity to han cros people's ideology and affect how people think about one another. it's ugly as racism but in some respects is larger. the number of people who would be unhappy if his child married someonto someone of the opposing political party is higher than the percentage of people