Funny, I remember my own Con Law prof. He was a proud liberal, as most of them are, but we got off on a tangent about Scalia one day. His take on the good judge was that, as an unabashed liberal, he disagreed with virtually everything that Scalia stood for. However, as an honest unabashed liberal, he couldn't help but admit that Justice Scalia was also one of the most brilliant legal minds to ever sit on the Supreme Court.
That's what you need, and what I don't mind - honest and forthright liberal professors ;)