Well, a couple of flip answers:
(a) Young people don't vote very much
(b) By the time they get old enough to get serious about voting often, the real world has sobered them up from the dubious socialization they got as part of their college education
The professoriate is extremely liberal - that doesn't mean they are evil. The best professor I ever had was an avowed liberal, and he helped me tremendously and I still keep in touch with him. But, in class, he played both sides of the ball equally - you never knew his personal politics.
Unfortunately, that isn't the case enough. And that is the problem.
It is hard to get - not hard to keep.
I absolutely agree - I don't think every pursuit can be commodotized, nor do I think every endeavor of thought need be part of a profit-driven profession. I love the idea of academia. But far too often, academia is the refuge of those folks who want to hide out in the world of theory. Never forget, professors don't just sit around be paid to be philosophers - they have to teach people and impart knowledge. If a professor does nothing but sit around and spin useless theory all day long, he isn't doing his job.
And that is being generous. Never forget, the radical Left explicitly stated in the 60s that they wanted to start a "long march through the institutions" in order to get the next generation to challenge society/the patriarchy/the military-industrial complex, etc. - and higher education was ground zero for that agenda.
They outrightly said this is what they wanted to do - and you don't believe them?
I actually agree with this, absolutely - but I do think many academics use academia as a refuge because they would otherwise starve in the real world.