A campaign button features an image of U.S. Democratic presidential candidate Senator Barack Obama and John F. Kennedy in Troy

 
A campaign button features an image of U.S. Democratic presidential candidate Senator Barack Obama and John F. Kennedy in Troy
A campaign button worn by a supporter of U.S. Democratic presidential candidate Senator Barack Obama (D-IL) features an image of Obama (L) and former U.S. President John F. Kennedy, during a town hall-style meeting at Troy High School in suburban Detroit, June 2, 2008. The United States will hold its final democratic primaries in South Dakota and Montana on June 3. REUTERS/Jason Reed (UNITED STATES) US PRESIDENTIAL ELECTION CAMPAIGN 2008 (USA)