The justices will administer the oaths to Obama and Biden twice, at the "private" swearing-in on the constitutionally mandated date of Sunday, Jan. 20, and again during the public ceremony on Monday, Jan. 21. Obama trashed the ruling at his State of the Union Address with Roberts and six other justices sitting right in front of him. The Supreme Court.” “Whether it rises to the level of other kinds of presidential-judicial rivalries is something we’ll probably have to judge in retrospect.” 
 
 Obama and Roberts’s relationship got off to a famously rocky start during the 2009 Inauguration, when Obama jumped in prematurely to recite the oath and the chief justice then mangled the wording. The two stumbled through the ceremony four years ago, and had to take a do-over later to make sure constitutional standards were met.
– Washington is still putting the finishing touches on tomorrow's every-four-years inauguration party, but it'll be a day late: President Obama will quietly be sworn in for a second term today, due to a Constitutional quirk that mandates that the commander in chief be sworn in at noon on January 20. Because that fell on a Sunday, when inaugurations aren't held, Obama will take the oath at the White House today and tomorrow's ceremony is essentially a re-enactment, reports the AP. Chief Justice John Roberts—who famously flubbed the oath four years ago—will swear the president in both times, notes Politico in a look at the at-times tempestuous relationship between the two men. Joe Biden was also sworn in this morning in a small ceremony at the Naval Observatory, with Justice Sonia Sotomayor administering the oath. Roll Call notes that he used a 5-inch-thick Bible that had been in his family since 1893; Sotomayor is the first Hispanic justice to swear in a president or vice president, reports the Washington Post. "Above all, I’m happy for the chance to be sworn in by a friend—and someone I know will continue to do great things," said Biden.