UPDATE: On the other hand, Richard Posner has these observations on academic freedom, inspired by Larry Summers:
But no one who has spent much time around universities thinks they've ever "encourage[d] uncircumscribed intellectual explorations." The degree of self-censorship in universities, as in all institutions, is considerable. Today in the United States, most of the leading research universities are dominated by persons well to the left of Larry Summers, and they don't take kindly to having their ideology challenged, as Summers has now learned to his grief. There is nothing to be done about this, and thoughtful conservatives should actually be pleased. As John Stuart Mill pointed out in On Liberty, when one's ideas are not challenged, one's ability to defend them weakens. Not being pressed to come up with arguments or evidence to support them, one forgets the arguments and fails to obtain the evidence. One's position becomes increasingly flaccid, producing the paradox of thought that is at once rigid and flabby. And thus the academic left today.