Malia (R) and Sasha Obama, daughters of U.S. Democratic presidential candidate Senator Barack Obama (D-IL) play on a merry-go-round in a playground during the Hamilton County family picnic in Noblesville, Indiana May 3, 2008. The Indiana Presidential Primary will be held on May 6. REUTERS/Jason Reed (UNITED STATES) US PRESIDENTIAL ELECTION CAMPAIGN 2008 (USA)