US Democratic presidential candidate Senator Hillary Clinton speaks during a campaign event at University of Pennsylvania in Philadelphia

 
US Democratic presidential candidate Senator Hillary Clinton speaks during a campaign event at University of Pennsylvania in Philadelphia
US Democratic presidential candidate Senator Hillary Clinton (D-NY) speaks during a campaign event at the University of Pennsylvania in Philadelphia, Pennsylvania March 24, 2008. REUTERS/Tim Shaffer (UNITED STATES) US PRESIDENTIAL ELECTION CAMPAIGN 2008 (USA)