Judge J. Michael Luttig of the federal appeals court in Richmond, Va., one of the handful of people seen as uppermost on President Bush's list to fill a Supreme Court vacancy, stood nine years ago as a groomsman at the wedding of another assumed to be on that same short list, Judge John G. Roberts of the Court of Appeals for the District of Columbia Circuit, who once clerked for Chief Justice William H. Rehnquist. One of Judge Luttig's own former clerks, Theodore Ullyot, is chief of staff to Attorney General Alberto R. Gonzales, another potential nominee, who served on...