It showed in Detroit, Southfield, Flint, Saginaw, Lansing.
the Bush DUI revelations had in the last days before the election. This in itself probably shifted at least 1% of the vote nationally, and the impact in the MidWest was probably 2-3% in some areas
The DUI probably heavily hit with the Soccer Moms AND the Macomb types. Bush did poorly in Canton(52% win - should be 55-60) and lost Macomb, the Reagan Dem county. Lost Suburban Oakland as well(Soutfield mainly)
Another thing that happened was that the Green Party vote imploded over that last weekend. The polls were showing Nader has making a significant different right up until the election day, and then it all evaporated. I think a lot of tree huggers got into the voting booth, and just couldn't bring themselves to vote for Nader, because they knew it would help Bush.
Finally, there was Buchanan. People talk a lot about how Nader cost Gore the election, but no one mentions that in a number of those states Gore won by 1% or less, Buchanan's votes would have made the difference, if they had been cast for Bush. Now of course, not ALL of them would have been, if Buchanan hadn't run -- some would have stayed home. But the same is true of Nader. At the moment, I don't see any likelihood of an independent conservative candidate as strong (relatively speaking) as Buchanan, and that could tip some of the 1% states back to Bush.
And there's always incumbency. Figure it to be good for 1% to 5%, depending on the state and the circumstances in the country and the world on election day. I think right now Bush has to be the favorite, but it will still be close, and we could lose if we don't get out there and fight.