Some critics of academic social science, and political science in particular, have recently asserted that it's difficult to see the benefit of what we do. To be fair, our output is less immediately tangible than the Hubble Space Telescope, treatments for HIV/AIDS, or the decoding of the human genome, to take only three visible and valuable recipients of federal funding for science in my lifetime.To date, however, the defenders of political science have been a little less full-throated in their case for our discipline than one might have expected. It is all well and good that this recipient...