books.google.com - Over the course of the last century, political scientists have been moved by two principal purposes. First, they have sought to understand and explain political phenomena in a way that is both theoretically and empirically grounded. Second, they have analyzed matters of enduring public interest, whether...http://books.google.com/books/about/The_Evolution_of_Political_Knowledge.html?id=8quZjXx1mYoC&utm_source=gb-gplus-shareThe Evolution of Political Knowledge