The New York Times > Education > Republicans Outnumbered in Academia, Studies Find
Two new studies show that professors at Stanford and UC Berkeley are overwhelmingly Democrats -- by at least 9:1.
1. Federalist Papers points out that a "small republic" can become dominated by a cohesive faction that using majority voting to outnumber and oppress the rest.
2. Lakoff thinks it's because academia attracts people interested in "helping society as a whole", which tends to be more consistent with Democrats' values. This is Robert Bork's view also.
I think that no matter what the explanation, it's bad news when academia is no longer a place where ideas are debated from all sides.