Having spent a few days recently venting about social scientists, let me tip my hat to one such whom I admire, Trinity College's Mark Silk, although he is so much more than a social scientist. Nonetheless, when looking at survey data, such as that released by Pew last week, it is always a good idea to see what Silk has to say about the results because he often sees things that escape the rest of us. Here is his latest. The key thing he discerns: Republicans are more dissatisfied with their party than Democrats, and the sources of dissatisfaction are exactly opposite. More Republicans think their party is too moderate and more Democrats think their party is not moderate enough. So, if you are worried about polarization.....