US Democratic presidential candidate Senator Barack Obama speaks at his Pennsylvania primary election night rally in Evansville

 
US Democratic presidential candidate Senator Barack Obama speaks at his Pennsylvania primary election night rally in Evansville
US Democratic presidential candidate Senator Barack Obama (D-IL) speaks at his Pennsylvania primary election night rally in Evansville, Indiana, April 22, 2008. REUTERS/John Gress (UNITED STATES) US PRESIDENTIAL ELECTION CAMPAIGN 2008 (USA)