Alright, here's another map-based rollover. The instructions are pretty simple: click on a state to toggle through its party selection. Click on one of the three selections above to change scenarios.
In the next month or so, I'll be putting together a tutorial on this. But in the meantime, have some fun. Download. Ask questions if you need.
For more on these types of maps, checkout:
Choropleth Maps with Excel
How about another screenshot?