The Supreme Court has often dealt a big blow to presidents in their second term.
Harry Truman was rebuked for claiming the power to seize strike-bound steel mills during the Korean War. Richard Nixon resigned shortly after the court ruled unanimously he must turn over the Watergate tapes.
Bill Clinton's impeachment was triggered by the court's decision that he must answer questions under oath in the Paula Jones sexual harassment case. And George W. Bush lost before the court when he claimed his power as commander in chief gave him almost unfettered authority over prisoners held at the Guantanamo Bay prison.
Now, as President Obama begins his last year in office, the...