Democratic presidential candidate Senator Barack Obama smiles as he leaves 10 Downing Street in central London

 
Democratic presidential candidate Senator Barack Obama smiles as he leaves 10 Downing Street in central London
U.S. Democratic presidential candidate Senator Barack Obama (D-IL) smiles as he leaves 10 Downing Street in central London July 26, 2008. REUTERS/Alessia Pierdomenico (BRITAIN) US PRESIDENTIAL ELECTION CAMPAIGN 2008 (USA)