True, but in something like Con law or history, the professor may weave their own prejudices in as truth, and it becomes a problem.
Turn it into a positive. You want to contribute without being confrontational. You want to put your ideas in front of the class without challenging the Professor's position at the lecturne. You're unlikely to change his mind, so winning isn't the point - contributing is. Being an intelligent, non-controversial conservative can actually get you bonus points with some Professors who appreciate academic/intellectual exchange - as long as he thinks he won (or at least tied) in front of the class.
None of that's gonna get in your way because you're going to read and understand the cases. ;-)