Vice President Joe Biden takes the oath of office during the 57th Presidential Inauguration official swearing-in ceremony at the Naval Observatory on Sunday, January 20, 2013 in Washington. The oath is administered by US Supreme Court Justice Sonia Sotomayor. (AP Photo/Saul Loeb, AFP)

Associated Press
Vice President Joe Biden takes the oath of office during the 57th Presidential Inauguration official swearing-in ceremony at the Naval Observatory on Sunday, January 20, 2013 in Washington. The oath is administered by US Supreme Court Justice Sonia Sotomayor.   (AP Photo/Saul Loeb, AFP)
Vice President Joe Biden takes the oath of office during the 57th Presidential Inauguration official swearing-in ceremony at the Naval Observatory on Sunday, January 20, 2013 in Washington. The oath is administered by US Supreme Court Justice Sonia Sotomayor. (AP Photo/Saul Loeb, AFP)
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