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.

What's more, calling the president a cretin absolves him of responsibility. Like Reagan, Bush avoids blame for all manner of contradictions, implausible assertions, and outright lies by appearing an amiable dunce. If he knows not what he does, blame goes to the three puppeteers, Cheney, Rove, and Rumsfeld. It also breeds sympathy. We wouldn't laugh at FDR because he couldn't walk. Is it less cruel to laugh at GWB because he can't talk? The soft bigotry of low expectations means Bush is seen to outperform by merely getting by. Finally, elitist condescension, however merited, helps cement Bush's bond to the masses.

But if "numskull" is an imprecise description of the president, it is not altogether inaccurate. Bush may not have been born stupid, but he has achieved stupidity, and now he wears it as a badge of honor. What makes mocking this president fair as well as funny is that Bush is, or at least once was, capable of learning, reading, and thinking. We know he has discipline and can work hard (at least when the goal is reducing his time for a three-mile run). Instead he chose to coast, for most of his life, on name, charm, good looks, and the easy access to capital afforded by family connections.

The most obvious expression of Bush's choice of ignorance is that, at the age of 57, he knows nothing about policy or history. After years of working as his dad's spear-chucker in Washington, he didn't understand the difference between Medicare and Medicaid, the second- and third-largest federal programs. Well into his plans for invading Iraq, Bush still couldn't get down the distinction between Sunni and Shiite Muslims, the key religious divide in a country he was about to occupy. Though he sometimes carries books for show, he either does not read them or doesn't absorb anything from them. Bush's ignorance is so transparent that many of his intimates do not bother to dispute it even in public.