re: Why Scientists and extremely smart people are usually socialist/leftist

I don't think he's necessarily overestimating how smart scientists are; however, I think he is overestimating how many smart people gravitate to a certain political view. Sure we know Paul Krugman's political views as well as the post-modernists and constructivists in various disciplines that write these long essays that get published in Magazines. But we are probably mostly unaware of most scientists in the hard sciences working long hours in labs or those in the social sciences analyzing real-world applied data. They are trying to solve real problems rather and don't have time to publish abstract compositions without any evidence.