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Google's Political Ad Database
Tracks political advertising in the United States (and other countries). 2018 to present.
Political TV Ad Archive
Focuses on the 2016 US Presidential Election, from the Internet Archive.
Policy 2020 Brookings
Policy 2020 aims to empower voters with fact-based, data-driven, non-partisan information to better understand the policy matters discussed by candidates running for office in 2020. With resources available in English and Spanish, and in a variety of formats, Policy 2020 seeks to reach all Americans aspiring to be well informed on the issues shaping the 2020 election.
Evaluating Websites Guide
Where does your favorite Media site fall in on these two charts?