John McCain is apparently losing control of the tenor of his campaign. An Associated Press story reports that angry crowds at Republican events are asking their candidate to get tougher and some supporters are shouting "terrorist" and "off with his head" in reference to Barack Obama. At one point when McCain tried to reel in the crowd he was booed. The article goes on to say that the mood of the crowd is angrier at events that Sarah Palin appears at. She apparently brings out the real lunatic fringe of the GOP.
By choosing Palin and airing ads that are all negative, McCain has planted these seeds. He shouldn't be surprised at the results.