(Analysis) Often, the Supreme Court takes the advice of the U.S. Solicitor General when, seeking to preserve the Court’s energies and its authority, the SG urges the Court to pass up this case or that. ... Vance’s attorney at the lectern Monday, University of Virginia law professor Daniel R. Ortiz, had hardly begun when Chief Justice John G. Roberts, Jr., tried out a hypothetical — one that had a point behind it, but that would not come out immediately.