I read something quite a while ago on Obama's oratory skills and the general smoke and mirrors of his image. I vaguely remember the piece mentioned that he would model his delivery and speaking patterns on Martin Luther King, or generally any other American black pastor-type personality where they throw in biblical vocabulary and associated vocal "tricks" to make it seem as if he was preaching to the flock rather than merely addressing the electorate. I can't remember the exact details, but I do remember the article stating that many of his major speeches leading up to his presidency and those he made after he'd secured the election were high on emotion and rhetoric but without actually presenting anything concrete. It was very interesting, I wish I'd saved the piece.