I love alternate history. Imagine one where Rehnquist lives a few years longer, assuming he doesn't leave before 2009. Roberts was originally nominated to replace O'Conner. She was going to leave upon a confirmation. Then Rehnquist died and Bush withdraws that nomination and renominates him to replace Rehnquist. Who would Obama have picked in 2009 to not only replace Rehnquist but as Chief Justice?