I have a deeply held conviction that gerrymandering is the fundamental political problem facing the United States. This conviction is more or less uninformed by actual theory, evidence, or firsthand knowledge of American politics. For, like many economists and political scientists, I only use evidence to inform my opinions of my professional work.
As it happens, Justice Stevens agrees with me about gerrymandering, going so far as to suggest a constitutional amendment to inhibit it. (Technically, of course, it might be more accurate to say I agree with Justice Stevens.) Pointers to other literature welcome.