However, that he assumes the best political ideological model that captures professors and students is "Right" versus "Left" is unwise. Despite media shorthand, American politics is poorly reduced to just two opposing stances. It isn't just that there might be a third, some "Middle," but that there are more (for instance, "libertarian" variants that are not well captured as either Right or Left or Middle, and such folks are easily found in university and college faculties).
This is a problem I faced in my own research, but unfortunately everyone uses that terminology. The terminology isn't accurate, but because no one uses a more nuanced description it's all we've got.