Maybe you have heard about GW Bush's first campaign, running for Congressman. His opponent framed him as a spoiled Northeastern intellectual yuppie, and he lost big time. Rumor has it that after the election he swore he would never again be taken as being too smart, and adopted the dumb rancher personna to compensate.

One may take this theory or leave it... Here's an old writeup of his campaign...
http://www.texasobserver.org/showArticle.asp?ArticleID=1175