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Well, Naturally We're Liberal
...Rather, academe leans left because it takes a proportionally significant number of liberal-arts professors to hone the basic intellectual skills that we expect of college graduates: things like interpretive reading, cogent writing, critical thinking, and a sense of a shared historical tradition and the major issues currently confronting our society and world. If those abilities and insights aren't addressed by the liberal arts, then they certainly won't be in Introduction to Finance, Calculus II, or Biochemistry.

So the real question isn't why academe is so liberal, but rather, Why are instructors in the liberal arts so, well, liberal? I think there are three basic reasons, all of them what common sense might predict, all rather obvious, and none in need of fancy research involving such things as "occupational role modeling" and "vocational engendering."

First, as the Times article notes, virtually all instructors in the liberal arts are aware of the disparity between their level of education and their financial situation. There's no secret that the liberal arts are the lowest-compensated sector of academe, despite substantially more advanced study than business instructors and the equivalent of those in the natural sciences. Just as important, there are few opportunities for liberal-arts scholars to supplement their incomes by serving on government and corporate boards, filing patents and licenses, and, of course, obtaining generous research grants. You don't have to be a militant Marxist to recognize that people's political persuasions will align pretty well with their economic interests. It's real simple: Those who have less and want more will tend to support social changes that promise to accomplish that; those who are already economic winners will want to conserve their status.

I don't mean to suggest that issues of conscience beyond the confines of crass self-interest don't play an important role for many in the liberal arts, but their basic economic condition virtually assures that those in the liberal arts will be natural-born liberals. Who, after all, would want to preserve a situation in which others who are equivalently educated and experienced—doctors, engineers, lawyers, scientists, colleagues in other areas, and, yes, chief executives—receive vastly more compensation, sometimes by a factor of 10 or 100?...

...A second reason that liberal-arts professors tend to be politically liberal is that they have very likely studied large-scale historical processes and complex cultural dynamics. Conservatives, who tend to evoke the need to preserve traditional connections with the past, have nonetheless contributed least to any detailed or thoughtful study of history. Most (although, of course, by no means all) prominent historians of politics, literature, the arts, religion, and even economics have tended, as conservatives claim, to be liberally biased. Fair enough. But if you actually take the time to look at history and culture, certain conclusions about human nature, society, and economics tend to force themselves on you. History has a trajectory, driven in large part by the desires of underprivileged or oppressed groups to attain parity with the privileged or the oppressor....

...As President Obama recently put it, any open-minded review of history (and perhaps especially American history) teaches at least one clear lesson: There is a "right side of history," Obama said­—the side of those who would overcome prejudice, question unearned privilege, and resist oppression in favor of a more just condition.

If you don't study history, whether because it doesn't pad quarterly profits, isn't sufficiently scientific or objective, or threatens your own economic status, then you won't know any of that. ...

...It is because we liberal-arts professors have a personal stake in our relative economic status; we have carefully studied the actual dynamics of history and culture; and we have trained ourselves to think in complex, nuanced, and productive ways about the human condition that so many of us are liberals. Most of us agree with President Obama that there is a "right side of history," and we feel morally bound to be on it. Although we'd like to see some parity in compensation with our colleagues, we chose our fields with full awareness of the tradeoff. Part of our compensation lies in knowing that our studies can complement our standing on the "right side," rather than having our basic commitments dictated to us by the limitations of other, narrower professions....