Michigan State University has this wonderful site where you can view political campaign ads from 1952 to 2004, among other things.
EASE History is a rich learning environment that supports the learning of US history. Over 600 videos and photographs are currently available in EASE History.
EASE History has three entry points: Historical Events, Campaign Ads, and Core Values. Learn about US History through the prism of US presidential campaign ads, better understand the complexities of campaign issues and their historical context by looking at historical events, and explore the meanings of core values by examining how these values have been applied in both historical events and campaign ads. Three learning modes, single and multiple theme searches, and resources support the comparing and contrasting of historical cases. EASE History’s goal is to support experience acceleration- to help learners think more like historians.
This is definitely worth visiting and keeping bookmarked. (Found the site via Blogspotting, another site worth keeping bookmarked.)