By Chris Casteel Washington Bureau ccasteel@oklahoman.comPHILADELPHIA — Hillary Clinton, accepting the Democratic nomination in her historic quest for the White House, attacked GOP opponent Donald Trump here Thursday as unfit for the presidency and promised to heal divisions in the country. “I will be a president for Democrats, Republicans, independents, the struggling, the striving, the successful, for all those who for vote me and those who don't,” she told cheering delegates at the Democratic National Convention. “For all Americans together.” Clinton, 68, a former U.S.