U.S. Vice President Biden is pictured sitting alongside Barbara and Jenna Bush during ceremony in East Room of White House in Washington

U.S. Vice President Joe Biden (L) is pictured sitting alongside Barbara and Jenna Bush (C, in grey), daughters of former U.S. President George W. Bush and first lady Laura Bush, during a ceremony in the East Room of the White House where their parent's official portraits were unveiled, in Washington May 31, 2012. REUTERS/Jason Reed (UNITED STATES - Tags: POLITICS SOCIETY)