I like the idea of having High School students talking about politics in the classroom, because as the old cliché goes they are our future.
I think it is important that the students begin to study and discuss/debate politics, because they will have a chance to start voting either while in their last year of High School, or shortly after they graduate, and having even a small grasp about issues and what candidates are proposing is important.
Politics is a touchy subject no matter what age you are. Many grown adults cannot talk politics without getting heated and causing arguments. Because of this I believe students in class should be encouraged to talk politics. Doing so at such a young age helps develop their minds and readies tthem for the real world where their politic choices have large consequences.