Actually, in mathematics, political discussions are quite civil. My political stance was well-known in the department, since I've been a conservative since my days there as a grad student. (I wrote an article for the first edition
of the Red and Blue, Penn's early 1980's conservative alternative paper.)
It's funny, I've met one prof who was openly conservative and he happened to be a math professor. I had him for stats and not only loved him as a teacher but for ones found a math that I absolutely loved.