I went back and looked at my 2008 blog posts post-election, and found (at https://hill-kleerup.org/blog/2008/11/07/whats_blue_and_red_and_pu.html) M E J Newman’s site to find a lot of map and cartograms of the 2012 election results.
http://www-personal.umich.edu/~mejn/election/2012/
One of my favorites is below, which is like the by-county map I used earlier, but shading between red and blue to represent county mixtures of votes. There are other variations on this, as well as proportionate cartograms (which get a bit messy).
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