Unless you mean intellectual diversity on campus.
Obama's Failure And College Political Culture
One thing that struck us when we were visiting colleges our kids were considering and that then struck our kids as college students was the uniformity of left wing views at elite colleges. By our daughter's account, the difference between Oberlin, where she started, and Chicago, which she transferred to, was that while at both schools most students took left wing views for granted, at Chicago they were at least curious as to why someone might disagree. At Oberlin the default assumption was that if you didn't agree you were either stupid or evil.