National Journal — a news magazine dedicated to politics; it also does a good job of analyzing political ads.
AP Images [Associated Press newspaper photo archive] — a wide range of AP (Associated Press) news photos (and some video) that chronicle both current and historical campaigns
Vanderbilt Television News Archive — " [...] the world's most extensive and complete archive of television news. We have been recording, preserving and providing access to television news broadcasts of the national networks since August 5, 1968."
www.4president.us — has a nice collection of political ads and images
Youtube — has lots of campaign ads, including historical ads — just search for a candidate's name and the year of the election
For more television new sources, try the Libraries' Television News Program Sources research guide
Other Presidential Speeches
For more speeches at other points in the presidency, try the Libraries':
Fact-Checking the Media
The following organizations claim to monitor bias in the media — either from a left- or right-leaning perspective:
Accurracy in Media — a conservative watchdog group since 1986
Media Matters for America — a liberal watchdog group
PolitiFact — from the St. Petersburg Times, this website keeps tabs on all the claims made by candidates and fact-checks and rates the claims from True to "Pants on Fire" lies