With, so far, only Ann Coulter stepping outside the conservative consensus and suggesting that John G. Roberts Jr., could be another David Souter, let me be the first to say that the next session of the Supreme Court will see it moving to the left. And this prediction applies however Roberts turns out. Even if he consistently votes with Clarence Thomas, the next session of the Supreme Court will produce more left-wing rulings than this one has done. In the short-term at least, conservatives will come to regret O'Connor's retirement. It is partly a matter of arithmetic and partly a...