A transcript of the remarks of Democratic Illinois Sen. Barack Obama, delivered March 18, 2008, in Philadelphia at the Constitution Center. In it, Obama addresses the role race has played in the presidential campaign. He also responds to criticism of the Rev. Jeremiah Wright, an unpaid campaign adviser and pastor at Obama's Chicago church. Wright has made inflammatory remarks about the United States and has accused the country of bringing on the Sept. 11 attacks by spreading terrorism.