Via the always amazing NY Times graphics folks comes this gem: a map depicting the shift in the electorate (to the right or left) state by state. What we see is a map that reminds me of the wind map (http://hint.fm/wind/), which shows, in real time, the movement of wind across the U.S.
In the NY Times political change map, movement to the right or left is depicted both as a color (the standard red and blue) but also as a distance by little flowing strands that wave across the landscape. I assume this is county by county data we're seeing. You can toggle between 2008 and 2012, which creates a very different political wind pattern.
The set of maps and graphics on this page also argue for other reasons that Mitt Romney lost the 2012 U.S. presidential election. The "Hispanic Voters Increase Support" map makes a case not only for an increase in support from Hispanic voters in Florida, but also for the impace of an increase in Hispanic population in the state from 2008 to 2011.