One answer is self-selection - the same sort of self-selection that leads Republicans to outnumber Democrats four to one in the military. The sort of person who prefers an academic career to the private sector is likely to be somewhat more liberal than average, even in engineering. ...

Think of the message this sends: today's Republican Party - increasingly dominated by people who believe truth should be determined by revelation, not research - doesn't respect science, or scholarship in general. It shouldn't be surprising that scholars have returned the favor by losing respect for the Republican Party.

Conservatives should be worried by the alienation of the universities; they should at least wonder if some of the fault lies not in the professors, but in themselves. Instead, they're seeking a Lysenkoist solution that would have politics determine courses' content.

And it wouldn't just be a matter of demanding that historians play down the role of slavery in early America, or that economists give the macroeconomic theories of Friedrich Hayek as much respect as those of John Maynard Keynes. Soon, biology professors who don't give creationism equal time with evolution and geology professors who dismiss the view that the Earth is only 6,000 years old might face lawsuits.

If it got that far, universities would probably find ways to cope - by, say, requiring that all entering students sign waivers. But political pressure will nonetheless have a chilling effect on scholarship. And that, of course, is its purpose.