LAWRENCE, Kan. -- Though he has been Chief Justice of the United States for nearly three years, John Roberts still seems to be a bit of a cipher. Yes, we know he's a conservative -- he wouldn't have the job he does today if a lot of well-placed people on the right didn't have a lot of trust in him. But I'm still not certain what that actually means for the court, and thus for the United States; I sense we still haven't seen a defining "Roberts Court" moment.