What You Should Know About Politics...But Don't by Jessamyn Conrad. Arcade Publishing (2008).
I wish I'd gotten this book sooner. Jessamyn Conrad has written the first ever non-partisan guide to American politics. While I haven't had the chance to read the entire book yet, Conrad's writing is easy to understand and lends an historical perspective to the issues we care about. As complicated and biased as coverage of political issues is, the need for a non-partisan guide is very real.
If you are slightly puzzled by the workings of the Electoral College or want to know more about any of the issues below, I highly recommend you read this invaluable resource.