Wilton Gregory, who came to Washington in May, is known through his long, prominent career for being nonconfrontational on hot-button issues in public, but working quietly behind the scenes - a model similar to the man he replaced, Cardinal Donald Wuerl. But on Thursday, Gregory signaled that he wants to use his higher-profile perch in the nation's capital to challenge the use of identity - racial, national origin or otherwise - as a tool of attack. ...