US Democratic presidential candidate Senator Obama (D-IL) speaks during a campaign event at the National Constitution Center in Philadelphia

 
US Democratic presidential candidate Senator Obama (D-IL) speaks during a campaign event at the National Constitution Center in Philadelphia
US Democratic presidential candidate Senator Barack Obama (D-IL) speaks during a campaign event at the National Constitution Center in Philadelphia, Pennsylvania March 18, 2008. Obama criticized his preacher for racially charged rhetoric but said he could not disown the man who baptized his children and officiated at his wedding during the speech about race and politics in America. REUTERS/Tim Shaffer (UNITED STATES) US PRESIDENTIAL ELECTION CAMPAIGN 2008 (USA)