I examined this question in a recent article in the journal Theory and Society. Focusing on sociology — my own academic discipline — I asked whether its well-documented political monoculture impacts the scientific quality of sociological research. To find out, I compared sociology to three other major social sciences: economics, political science, and psychology. All four lean left, but sociology is in a league of its own: For every Republican in the field, there are 44 registered Democrats. Nearly one in five sociology professors identifies as far left — more than quadruple the rate in economics and more than double the rate in political science or psychology.