Via Noah Smith, an interesting back-and-forth about the political leanings of professors. Conservatives are outraged at what they see as a sharp leftward movement in the academy:

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But what’s really happening here? Did professors move left, or did the meaning of conservatism in America change in a way that drove scholars away? You can guess what I think. But here’s some evidence. First, using the DW-nominate measure — which uses roll-call votes over time to identify a left-right spectrum, and doesn’t impose any constraint of symmetry between the parties — what we’ve seen over the past generation is a sharp rightward (up in the figure) move by Republicans, with no comparable move by Democrats, especially in the North:

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So self-identifying as a Republican now means associating yourself with a party that has moved sharply to the right since 1995. If you like, being a Republican used to mean supporting a party that nominated George H.W. Bush, but now it means supporting a party where a majority of primary voters support Donald Trump or Ted Cruz. Being a Democrat used to mean supporting a party that nominated Bill Clinton; it now means supporting a party likely to nominate, um, Hillary Clinton. And views of conservatism/liberalism have probably moved with that change in the parties.

Furthermore, if your image is one of colleges being taken over by Marxist literary theorists, you should know that the political leanings of hard scientists are if anything more pronounced than those of academics in general. From Pew:

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Why is this? Well, climate denial and hostility to the theory of evolution are pretty good starting points.

Overall, the evidence looks a lot more consistent with a story that has academics rejecting a conservative party that has moved sharply right than it does with a story in which academics have moved left.

Now, you might argue that academics should reflect the political spectrum in the nation — that we need affirmative action for conservative professors, even in science. But do you really want to go there?