Ageneration ago, the great majority of the most educated Americans voted Republican. The elder George Bush, for instance, defeated Michael Dukakis among college graduates by 25 points. But that advantage has been eroding, and last year Barack Obama became the first Democrat since Lyndon Johnson to win a majority of American voters with four years of higher education. This is no small bloc, especially within white America, where Republicans do best. Almost one-third of white Americans hold a college degree, up from one-fifth in 1990. Republicans cannot win without this growing group. To recover them, we Republicans need to do...