US Democratic presidential nominee Senator Barack Obama (D-IL) smells a sample of bio diesel fuel during a tour of the Pennsylvania Bio Diesel Plant in Monaca, Pennsylvania

 
US Democratic presidential nominee Senator Barack Obama (D-IL) smells a sample of bio diesel fuel during a tour of the Pennsylvania Bio Diesel Plant in Monaca, Pennsylvania
US Democratic presidential nominee Senator Barack Obama (D-IL) smells a sample of bio diesel fuel during a tour of the Pennsylvania Bio Diesel Plant in Monaca, Pennsylvania, August 29, 2008. REUTERS/Jim Young (UNITED STATES) US PRESIDENTIAL ELECTION CAMPAIGN 2008 (USA)