An important theme of US elite propaganda - going back in fact to the 18th century - is the inculcation of contempt for the unwashed majority on the part of the political class (today roughly the 20% of the population who've been to "a good college"). And the growth among the majority of the suspicion that Obama is a Muslim is a confused but accurate recognition that he's not working for them - so he must be working for someone else. Unfortunately the class language that's necessary to explain the real situation has been excluded from political discourse.
^^^^^ CB: Sort of the new "Anti-Semitism is the socialism of fools". Anti-Muslimism is the socialism of fools. (Of course, many Muslims are Semites, anyway)