The Parsons Institute for Information Mapping (New School) has put together a nice visualization that shows Electoral College results going back to 1789 in terms of the familiar "red state, blue state" maps.
The color-coding is sometimes a bit odd (Dems, Federalists and Whigs are all blue), but quite fascinating. I had no idea that both candidates in 1820 were Republican. The interface includes issue polling, though I don't know how to interpret the results. Overall, very interesting, likely useful for classrooms.
H/T to Statistical Modeling, Causal Inference, and Social Science for the link.