But Dr. Gouldner’s new-class theory should alert Democrats to a lurking danger. It is probably right that something like a culture of critical discourse can be found in the workplaces and households and in the publications read by Americans who have attended graduate or professional school. The challenge for the Democrats moving forward will be to develop appeals to voters that resonate not just with this important constituency, but also with other crucial groups in the Democratic coalition. Some of the draw of Donald Trump for white working-class male voters, for example, is that he does not speak in a culture of critical discourse. Indeed, he mocks that culture, tapping into class resentments.

The Democrats may find they need to give up a little of their wonkiness if they want resounding victories. It’s not in their long-term interest to be too much what Pat Buchanan once referred to as “the party of the Ph.D.s.”

Listen up, Hillary…