As Stupid Does

Kevin Drum has this cute quotation of General Tony Peak about President Bush:

America has been conducting an experiment for the past six years, trying to validate the proposition that it really doesn't make any difference who you elect president. Now we know the result of that experiment. If a guy is stupid, it makes a big difference.

Some of the commenters (for various reasons) want to insist that Bush is not "stupid" but just "willfully ignorant" (or the like). I don't get the distinction. Persisting in willful ignorance is but one form of stupidity.

(Via Egregious Moderation.)