Reacting to a new study on academia’s left-leanings, Megan McArdle explains how bias could result: Unless they are really, really brilliant, academics, like everyone else, need personal connections to help them up the academic ladder, from recommendations to mentors to advisors. Those personal connections are always much easier to make with people you agree with. Nor would I discount the possibility that, just as women’s work can be subtly dismissed because we know women aren’t as bright as men, academics who think that conservatives are stupid would factor that into their assessment of someone’s intelligence–and then factor that assessment into their assessment of someone’s work. And of course, one’s ideas are to some extent socially constructed; simply by virtue of the arguments and information we hear, even if there is no social pressure to conform, being surrounded by a political culture will tend to drag our ideas in their direction.