Biased academia

I don't know why I continue to be surprised at the level of the leftward tilt in academia. From today's New York Sun:

For those who need some kind of backup for what they know in their gut about colleges, feature a major new academic study showing that 72% of those teaching at American universities and colleges identify themselves as liberal and only 15% identify themselves as conservative. A dispatch by Howard Kurtz, on Page One of today's New York Sun, has the particulars. At the most elite schools, according to the study, the breakdown on the faculty is 87% liberal and 15% conservative. Mr. Kurtz points out that that is far out of step with the general population, which identifies as roughly 33% conservative and 18% liberal.