" For candidates who have no fear of losing to a member of the opposite party, the primary rather than the general election will be the decisive event in their campaigns. Whether liberal or conservative, candidates can be expected to adopt more extreme positions when competing within a single party than when competing with a member of the opposite party. I firmly believe that gerrymandering has made our elected officials more doctrinaire and less willing to compromise with members of the opposite party. "

― John Paul Stevens , Six Amendments: How and Why We Should Change the Constitution