First, I am a 2l with a poli sci undergrad. Your degree doesn't matter too much. FOr example, Crim majors sometimes suck at Crim law and Crim Pro. But a social science or humanities degree (like history,etc.) can help you understand and better appreciate the material. If you study poli sci or history in college, you'll end up reading federalist no. 10 for the 20th time in Con law. I think poli sci is the best, though. My legislation class in law school was much easier because of it, and so was Con law back in 1L.