I dunno, I really can't say that Bush is just playing with people or perhaps - he simply became use to speaking in front of people he was not used to speaking in front of prior to him becoming president.
Me? Technically I'm south of the Mason Dixon line. Half my family is from the far north, other half is from the deep south. I mix my language all of the time, but that doesn't matter when I'm giving speeches - I just can't give speeches for the life of me in front of groups of unfamiliar people.
Perhaps thats what Bush's problem was, because he has certainly become much better since his first speech. He may have not been used to speaking in front of Congress and that led to some problems.
But really, who cares about speech ability? Hitler was among the best, if not the best, and look what happened...
-SW