Senator Elizabeth Warren takes part in a mock swearing in ceremony with U.S. Vice President Joe Biden in the Old Senate Chamber on Capitol Hill

Senator Elizabeth Warren (D-MA) takes part in a mock swearing in ceremony with U.S. Vice President Joe Biden in the Old Senate Chamber on Capitol Hill in Washington on January 3, 2013. REUTERS/Joshua Roberts (UNITED STATES – Tags: POLITICS HEADSHOT) – RTR3C31H