ELECTION 2004: In case anyone is interested in information about the 2004 presidential election, I recommend heading over to Larry Sabato's Crystal Ball. It's a good source of information and analysis, and I thoroughly enjoyed reading it in the months leading up to November, 2002. He was incorrect in his prediction that the Senate would remain in Democrat hands (as was just about everyone else), but most of the rest of his predictions held up. In any event, there is more data there than I've yet to find anywhere else for an election that is so far away.
Obviously, there is also info about other national elections and gubernatorial races as well. Heaven, for a political junky like myself.