Jonah Goldberg opines:
For starters I think he's just wrong about Alinksy. The main reason Alinsky is hot right now with many conservatives is that, thanks to Beck and Horowitz, many are convinced that Obama is an Alinskyite and so many believe that you can't understand Obama without understanding Alinsky.
Second, his Amazon citation is at best selective. I went and checked the "customers also bought" feature for Rules for Radicals and found that customers also bought (in addition to the books David listed): The Constitution of the United States, American Progressivism: A Reader (RJ Pestritto's excellent and purely academic book), A Conflict of Visions by Tom Sowell, The Real Thomas Jefferson, The Road To Serfdom and Common Sense, The Rights of Man and Other Essential Writings of Thomas Paine.