2012 US Presidential election campaigns are out in full force now. If you’re trying to explain primaries and caucuses to your students, C.G.P. Grey has a new video explaining primaries. There is a little bit of editorializing in the video, but overall it is a good primer on the purposes and functions of caucuses and primaries.
Staying with the theme of political science, C.G.P. Grey also has a video explanation of Gerrymandering. The video uses animals instead of people and political parties to explain how Gerrymandering works. Again, there is a bit of editorializing in the video, but it still provides a good overview of the concept.