PRESIDENT BUSH NEEDS TO KEEP two facts in mind as he looks to replace retiring Supreme Court justice Sandra Day O'Connor (and, should he step down, Chief Justice William Rehnquist). The first is that he can win confirmation of almost any conceivable nominee for the High Court, screams of protest by Democrats and hostile media coverage notwithstanding. The second is that he has a promise to keep. Since he began running for the White House six years ago, he has declared endlessly his intention to select judges who interpret the law rather than create it--in a word, conservatives. On this,...