Chief Justice William Rehnquist may or may not retire in the next few weeks, but a U.S. Supreme Court decision handed down Monday suggests that the curtain has already fallen on his jurisprudential legacy. Academics and commentators, like American Enterprise Institute Scholar Michael Greve, credit the Chief Justice with “resurrect[ing] federalism as a judicially enforceable constitutional principle.” But, during the past several terms, the Chief’s five-justice coalition — aptly referred to as the “federalist five,” comprising Chief Justice Rehnquist and Justices Sandra Day O’Connor, Antonin Scalia, Anthony Kennedy and Clarence Thomas — has been unable to complete the constitutional paradigm...