When Al Gore endorsed Howard Dean's presidential bid on Tuesday, it was the most excitement Gore has generated since... since... well, the last time - whenever that was. Well, that's a bit unfair. For a sizable group of Democrats, Al Gore gets the blood pumping. For the rest of us, he's the human incarnation of footnotes: dry data compressed into an amazingly dull format. "The Simpsons" said it best when Bart's friend Martin bought a talking Al Gore doll. When you pull the string on the doll's back it says, "You are hearing me talk." No one knows what string...