Here are the newest additions to The Best Resources For Learning About The 2012 U.S. Presidential Election:

The History Channel has a nice collection of related videos.

Watching Debates With Kids is a good piece from Middleweb, and includes a nice downloadable sheet that students could use while watching the presidential debates.

Adomatic is from the National Constitution Center and lets you create your own Presidential campaign ad. Thanks to Richard Byrne for the tip.