In collaboration with The Atlantic and using the Internet Archive's Television News Archive, this new visualization allows you to track all mentions of the 2016 presidential candidates on domestic US national television networks over 2015, updated daily.  The visualization updates each morning, allowing you to trace how television coverage of each candidate is evolving over time. The tracker was recently cited in an Atlantic comparison of Trump and Carson.

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Interactive Explorer.  (Allows more refined drill-down of results by network/candidate).