The short answer is yes.
The long answer is yes and no.
Quotations collected over the years in Slate may leave the impression that George W. Bush is a dimwit. Let's face it: A man who cannot talk about education without making a humiliating grammatical mistake ("The illiteracy level of our children are appalling"); who cannot keep straight the three branches of government ("It's the executive branch's job to interpret law"); who coins ridiculous words ("Hispanos," "arbolist," "subliminable," "resignate," "transformationed"); who habitually says the opposite of what he intends ("the death tax is good for people from all walks of life!") sounds like a grade-A imbecile.
And if you don't care to pursue the matter any further, that view will suffice. George W. Bush has governed, for the most part, the way any airhead might, undermining the fiscal condition of the nation, squandering the goodwill of the world after Sept. 11, and allowing huge problems (global warming, entitlement spending, AIDS) to metastasize toward catastrophe through a combination of ideology, incomprehension, and indifference. If Bush isn't exactly the moron he sounds, his synaptic misfirings offer a plausible proxy for the idiocy of his presidency.
In reality, however, there's more to it. Bush's assorted malapropisms, solecisms, gaffes, spoonerisms, and truisms tend to imply that his lack of fluency in English is tantamount to an absence of intelligence. But as we all know, the inarticulate can be shrewd, the fluent fatuous. In Bush's case, the symptoms point to a specific malady—some kind of linguistic deficit akin to dyslexia—that does not indicate a lack of mental capacity per se.
Bush also compensates with his non-verbal acumen. As he notes, "Smart comes in all kinds of different ways." The president's way is an aptitude for connecting to people through banter and physicality. He has a powerful memory for names, details, and figures that truly matter to him, such as batting averages from the 1950s. Bush also has a keen political sense, sharpened under the tutelage of Karl Rove.
http://www.slate.com/Default.aspx?id=2100064&