From a professor at a major university:

To hammer a point home.
There is academia and then there are sciences. If you’re a PhD in physics,
mathematics, biology, engineering etc. your political orientation does not
matter one bit. I chair a faculty search, hire a postdoc, and evaluate
prospective graduate students and I don’t even know (nor do I care) what
political orientation they have. It does not matter!
The problem is not with the liberals in universities, the problem is with
the liberal arts: they are not objective disciplines, nor are they supposed
to be. Sooner or later they will be dominated by this or that kind of
subjective nons… errr, opinion.
And yes, we liberals do dominate the hard-science departments, but it
has nothing to do with a left-wing bias. I’ll change my mind if you
point me to any right-wing think tank specializing in physics. :)
Cordially,