@Robert Gentel,
It's also worth remembering that it's advantageous for each side to make it seem like a close race, because each of them need to get people to actually get out and vote. A candidate who was "predicted" to have a 98% chance of winning could conceivably lose simply because people believed the prediction and decided they didn't need to cast their vote.
In past elections I have found the consensus of Vegas Bookies predictions to be the most accurate, probably because they make (or lose) money based on their objectivity.