Over the weekend, we learned that longtime Supreme Court Justice John Paul Stevens (who is almost 90 years old) plans to retire as soon as this summer. What should we make of his public desire to have President Obama name his successor? What is the legacy of Stevens on the high court? And what kind of fight can we expect over the next Obama nominee? We ask Ed Whelan, president of the Ethics and Public Policy Center and former clerk for Supreme Court Justice Antonin Scalia.