Disciplinary differences

Some interesting research on "Why do students in different disciplines have different political attitudes?" (Found via Ryan Sager's Neuroworld.) The upshot of one study is that self-selection is the major effect; students go into sociology, say, because they're left-leaning, more than that they become left-leaning because they go into sociology. That jibes with my own experience. I would never have majored in sociology, and chose economics and history instead partly on the expectation that they were less prone to leftism than some disciplines (a plausible view, particularly regarding economics).