Noam Chomsky may well be right about the former president’s conspicuous and repeated mispronounciments:
The focus is on personalities, on Jeremiah Wright’s sermons, Sarah Palin’s pregnant daughter, or whatever it may be. In that terrain, the Republicans have a big advantage. They also have a formidable slander and vilification machine which has yet to go into full operation. They can appeal to latent racism, as they are already doing. They can construct a class issue. Obama is the elite Harvard liberal; McCain is the down to earth ordinary American, and it so happens that he is one of the richest people in the Senate.
Same thing they pulled for Bush. You have to vote for Bush because he is the kind of guy you would like to meet in a bar and have a beer with; he wants to go back to his ranch in Texas and cut brush. In reality he was a spoiled fraternity boy who went to an elite university and joined a secret society where the future rulers of the world are trained, and was able to succeed in politics because his family had wealthy friends.
I am convinced, personally, that Bush was trained to mispronounce words to say things like “mis-underestimate” or “nu-cu-ler”, so liberal intellectuals would make jokes about it; then the Republican propaganda machine could say see these elitist liberals who run the world are making fun of us ordinary guys who did not go to Harvard (but he did go to Yale, but forget it).