Having gone up through doctoral studies, it has been my experience that the vast majority of my instructors have been moderates. I guess if someone has a far right bias, a moderate might look like a liberal.
One of my instructors described this as political parallax - where from an extremist viewpoint (right or left) most everyone seems to be the opposite.
Extremist left perceive everyone else as conservative and extremist right perceive everyone else as liberal. That's the good thing about being a moderate - everyone else is an extremist.
I have been to both "liberal" and "conservative" schools and most of my instructors have been moderates. The only "agenda" I saw being pushed was trying to understand both sides.