U.S. President Obama and Vice President Biden laugh as they welcome Senator Specter at the White House in Washington

 
U.S. President Obama and Vice President Biden laugh as they welcome Senator Specter at the White House in Washington
U.S. President Barack Obama (L) and Vice President Joe Biden (R) laugh as they welcome U.S. Senator Arlen Specter (R-PA) (C) following Specter's announcement that he will switch to the Democratic party before he runs for re-election in 2010, at the White House in Washington, April 29, 2009. REUTERS/Jonathan Ernst (UNITED STATES POLITICS IMAGES OF THE DAY)