The scarcity of conservatives seems driven in part by discrimination. One peer-reviewed study found that one-third of social psychologists admitted that if choosing between two equally qualified job candidates, they would be inclined to discriminate against the more conservative candidate.

Yancey, the black sociologist, who now teaches at the University of North Texas, conducted a survey in which up to 30 percent of academics said that they would be less likely to support a job seeker if they knew that the person was a Republican.

The discrimination becomes worse if the applicant is an evangelical Christian. According to Yancey’s study, 59 percent of anthropologists and 53 percent of English professors would be less likely to hire someone they found out was an evangelical.

“Of course there are biases against evangelicals on campuses,” notes Jonathan L. Walton, the Plummer Professor of Christian Morals at Harvard. Walton, a black evangelical, adds that the condescension toward evangelicals echoes the patronizing attitude toward racial minorities: “The same arguments I hear people make about evangelicals sound so familiar to the ways people often describe folk of color, i.e. politically unsophisticated, lacking education, angry, bitter, emotional, poor.”