Caution: I went to college during the Crusades
My experience has been some of both...I went to Cal in the late 70's and graduated with a BS in Economics and a BA in PoliSci, both non-engineering or science-based. I needed a lot of math, but stats came easy since there were $ signs attached to the answer.
Contrary to many of the posts, there was little, "indoctrination" and a tolerance for debate, especially with the econ profs. The PS profs were a little more crunchy, but the mix was about even: my favorite prof was a Cuban exile who was absolutely the most passionate, true conservative I have ever met. I ended up doing my econ thesis on the Cuban economy during and after Batista. The impact of Castro was profound, right down to causing a change in traditional diets.
I ran into one prof who had a world view that was fixed and not about to be changed by mere students...and he was not above awkward, thinly veiled threats. I don't know if he ever followed though, but he was the exception.
If the tide has ebbed in the right mix of conservative and liberal professors we should all feel saddened: I was challenged to think by both and would have felt cheated had I not had the exposure.
I have been amused by many of the, "opened minded" references in other threads followed quickly by a, "Sig Hiel" if other poster disagree. I can tell you that that type of discourse would have not been tolerated by ANY professor I had. If that is not so today, mores the pity.