I think both things are true. It clearly is a contributing factor toward polarization, and I think others would agree with that. If you don't trust the institutions that are supposed to be objective—and if not neutral, at least diverse—to rigorously go through material to tell you what is true, that's going to lead to polarization. It's going to lead people to look for alternative viewpoints, some of which may be credible and many of which will not be credible. Higher education institutions have a duty to deal with this problem head-on and see it as a major concern.
Another witness mentioned that, say, in business schools or engineering schools, the implication was that this wasn't a problem. Our survey specifically looked at that, and we expected that to be the case, but we found that it was not a significant difference. The political skew at universities might vary slightly depending on the discipline, but, as I said, 88% of a representative sample of professors from across the country identifies on the left.