This is a very interesting piece of work by VisPolitics. They have maps, geolocated time series, and a density plot all in one, with names appearing on the right and moving vertically and in size over time. And all these aspects look good too. My favourite section is the Obama vs Romney one, which kicks off around 0:27. I liked it because it was clearer to me what was going on (as a Brit who has never set foot in Boston).
Of course, if it was interactive that would be even better, but a huge amount of work.