PBS
Pbs: The :30 Second Candidate
Great PBS site for the Democracy Project. This site is all about televisions role in political advertising. There is a timeline, step-by-step process of commercials, and a look at tricks of the trade.
Other
History News Network: Why Is News So Negative These Days?
This is actually the third installment in a five-part series of articles that looks at the question - "Where Have All the Voters Gone?." This particular article takes a look at the negativity in the news, but you may want to take a look...