CHICAGO - JUNE 8:  Democratic presidential candidate Sen. Barack Obama (D-IL) speaks to a crowd of supporters at a fundraiser in the Great Hall at Union Station while wife Michelle Obama observes June 8, 2007 in Chicago, Illinois. The event called 'GenBO (Generation Barack Obama) After Hours with Barack and Michelle Obama' had a suggested donation of $100. Getty Images logo Getty Images 57 months ago

CHICAGO - JUNE 8: Democratic presidential candidate Sen. Barack Obama (D-IL) speaks to a crowd of supporters at a fundraiser in the Great Hall at Union Station while wife Michelle Obama observes June 8, 2007 in Chicago, Illinois. The event called 'GenBO (Generation Barack Obama) After Hours with Barack and Michelle Obama' had a suggested donation of $100.