Some good #dataviz discussion on the pros/cons on the usage of choropleth maps in this thread, and who has responsibility for clarity and understanding.
As much as I like lovely exercises like this, we need to stop saying that the choropleth map is "misleading". It can be misleading *if you don't know how to read it for the purpose it was created for*—to show who won were, nothing else. The problem isn't the map, but its improper interpretation.