WASHINGTON, DC - JANUARY 03:  U.S. Sen. Elizabeth Warren (D-MA) (L) participates in a reenacted swearing-in with U.S. Vice President Joe Biden in the Old Senate Chamber at the U.S. Capitol  January 3, 2013 in Washington, DC. Biden swore in the newly-elected and re-elected senators earlier in the day on the floor of the current Senate chamber.  (Photo by Chip Somodevilla/Getty Images)