After receiving, for what must be the hundredth time, the canonical light bulb joke list, I came up with this: Q: How many senior Presidential Aides does it take to change a light bulb? A: None. They're supposed to keep the President in the dark. A' : One: to award a billion dollar sole-source contract with Halliburton to replace it. A'': thirty-eight: One to say that no one could have foreseen the bulb's burning out, one to spin stories for newspapers that the President's bulb-changing program is working well, and thirty-five to go out on talk shows to accuse the Democrats of being weak on light, and one to deny rumors that it's still dark in there. A''': sixty: thirty to bribe staffers to write letters telling everyone how wonderful it is to sit in the dark, and thirty more to bribe newspaper editors to publish those letters. A'''': The Administration will defend its policy of warrant-less surveillance of all Americans suspected of supporting foreign terrorist bulbs entering this country.