I never experienced any pressure to include any party's beliefs in lecture, plus there is not much political about chemistry (my field) so it wouldn't be relevant to the subject. I have my own thoughts about academia's heavy leaning to the left. So many who make a career out of academia have been in school or working for a school since they have been five years old. That doesn't give them much of a chance to work in the real world. Lack of experience in other working environments can lead to some pretty closed thinking - thinking based only on limited experiences.