Rev. Michael Pfleger of Chicago delivers a keynote address during the Martin Luther King, Jr. annual Commemorative Service in Atlanta, in this January 20, 2003 file photo. The campaign team of US Democratic presidential candidate Sen. Barack Obama (D-IL) apologized on May 29, 2008 for remarks made in a Pfleger sermon, in which he mocks Democratic presidential candidate Sen. Hillary Clinton (D-NY). REUTERS/Tami Chappell/Files (UNITED STATES)