I came across these graphics today and thought they were interesting. I can remember seeing the 2004 graphic shortly after the 2004 election and was interested to see just how "purple" the US is. It doesn't look like it has really changed all that much.
I was looking at some other stats prior to the election that suggested this election would be won or lost in the urban centres of the swing states. That ultimately this election was an Urban vs. Rural election. From some of the stats I have seen post election, it played out that the cities were the places that Obama won. What was fascinating was just how few urban votes he needed to gain on 2004's results to win a state.
State Metro Increase to Win
NM 0.008414497
IA 0.009344614
OH 0.021970032
NV 0.02706302
FL 0.051198009
CO 0.0512231
MO 0.082884769
VA 0.09209499
NC 0.135344697
WV 0.170061948
IN 0.22009237
MT 0.313605308
ND 0.394913127