Joe Keohane has a fascinating summary of our political biases in the Boston Globe Ideas section this weekend. It's probably not surprising that voters aren't rational agents, but it's always a little depressing to realize just how irrational we are. (And it's worth pointing out that this irrationality applies to both sides of the political spectrum.) We cling to mistaken beliefs and ignore salient facts. We cherry-pick our information and vote for people based on an inexplicable stew of...