Exactly what I was and am concerned about, still. I open my mouth plenty, and have earned a great deal of respect from my professors, despite that fact, lol. However, I know just how far to push, and I cannot risk getting blackballed or failed because I do not agree with their agenda(s). I will take my fight to them, at some future time, when there is a level playing field, not when I am at their mercy for a passing grade, so required for me to begin my career (and pay back my loans).
That was me in college as well. And it definitely caused me to have to work sometimes several times harder than my liberal classmates for the grade I deserved, but I was incapable of compromising my fundamental values in deference to their "authority." Can't tell you how many times a fellow student approached me following class and said, "wish I'd said that" or "I'm so glad you said what you did because it's what I was thinking."