After the 2000 and 2004 election the United States, which was a 50:50 nation, looked far more red on a map since the blue states were much more densly populated than the red. This was seen in maps which corrected for population. Mark Newman of the Department of Physics and Center for the Study of Complex Systems at the University of Michigan has already come out with some maps for this year’s election results. Here is one map corrected for population:
Of course each state is not uniformly composed of supporters for any one candidate, with much of the country really being purple. Here is a map which breaks down the results by county, using shades of red and blue (or purple) to represent the percentage for each canddiate:
Additional maps are also present, including versions of this based upon population.
As for the origins of red for Democrats and blue for Republicans, see this post from yesterday.