If we were to rely on what the pundits and politicians tell us, we would have to conclude that America is a deeply conservative nation. Americans, we hear constantly, detest government, demand lower taxes and the end of welfare, and favor the death penalty, prayer in school, and an absolute faith in the free market. And yet Americans believe deeply in progressive ideas. In fact, progressivism has long been a powerful force in the American psyche. Consider that a mere generation ago the struggle...