Prezvid.com

http://www.prezvid.com

Jeff Jarvis and Peter Hauck maintain this site, which places importance on the the role of video in the upcoming presidential election.

Techpresident.com

http://www.techpresident.com

Andrew Rasiej and Micah Sifry started this group blog to show how the presidential candidates are using the Web, and how it is affecting their campaign. It offers opposing viewpoints and opinions.  

Truveo - 2008 Election Center

http://www.truveo.com/2008-election-videos

Truveo searches for video from across the Web related to a variety of different topics. The link above deals solely with the presidential election.

Washington Post - Mixed Messages

http://projects.washingtonpost.com/politicalads/

This site tracks political advertising, it is a database of all advertisements funded by campaigns, parties, committees, and advocacy groups. The ads can be searched through a variety of ways, such as year, state, character, race, type, among others.

Google Elections Video Search

http://www.google.com/educators/videosearch.html