Speaking to a bar association meeting in Las Vegas last week, United States Supreme Court Justice John Paul Stevens confessed that he thought one of his own recent opinions, though correct as a matter of law, was wrong as a matter of policy. Stevens authored the majority opinion in Kelo v. City of New London, which upheld the forced sale of private homes to a commercial real estate developer. Yet he commented at the meeting that his constitutional judgment in that case was "entirely divorced from my judgment concerning the wisdom of the program."It seems that no one has...