U.S. Presidential Campaign Trails (in chronology): Candidates-29

U.S. Presidential hopeful Barack Obama (D-IL) greets a crowd of about 4,000 people at an event in Madison, Wisconsin, on Oct. 15, 2007.

U.S. Presidential hopeful Barack Obama (D-IL) greets a crowd of about 4,000 people at an event in Madison, Wisconsin, on Oct. 15, 2007.