The C-SPAN Video Library also collects some political ads for Congressional and other political candidates. Content can be filtered by date or additional keywords/terms.
Political TV AdArchive. The Political TV Ad Archive is a project of the Internet Archive. This site provides a searchable, viewable, and shareable online archive of 2016 political TV ads, married with fact-checking and reporting citizens can trust. Political TV ad spending is expected to be in the billions.
Living Room Candidate: Presidential Campaign Commercials, 1952-2004. An online exhibition presenting more than 300 television commercials from every election year since 1952, when the first campaign TV ads aired.