http://wilsonquarterly.com/stories/why-do-so-few-conservatives-work-in-higher-education/
From my own experience, Conservatives professors don't last long in ecliptic academic institutions where they are exposed to a broad range of ideologies and thoughts that conflict with their world view. It's the reason for colleges and universities such as Liberty, BYU, Bob Jones, Regent, and etc. If they can't dominate, they don't participate.