There is no evidence that Republican leaders have been demonstrably dumber than their Democratic counterparts. During the Reagan years, the G. O. P. briefly became known as the "party of ideas,” because it harvested so effectively the intellectual labor of conservative think tanks. ... In recent years, however, the Republicans' relationship to the realm of ideas has become more and more attenuated as talk-radio hosts and television personalities have taken over the role of defining the conservative movement that once belonged to thinkers.