US Democratic presidential candidate Senator Obama greets supporters at his "Super Tuesday" primary election night rally in Chicago

 
US Democratic presidential candidate Senator Obama greets supporters at his "Super Tuesday" primary election night rally in Chicago
US Democratic presidential candidate Senator Barack Obama (D-IL) greets supporters at his "Super Tuesday" primary election night rally in Chicago, Illinois, February 5, 2008. Twenty-four of the 50 states are holding nominating contests for one or both parties on "Super Tuesday" for a huge haul of delegates to this summer's conventions that will choose the candidates for the November presidential election. REUTERS/John Gress (UNITED STATES) US PRESIDENTIAL ELECTION CAMPAIGN 2008 (USA)