August:
https://www.realclearpolitics.com/articles/2019/08/22/ranking_the_2020_democratic_candidates_by_media_coverage.html
Sep:
https://fivethirtyeight.com/features/which-democratic-presidential-candidate-was-mentioned-most-in-the-news-last-week-8/
https://fivethirtyeight.com/features/which-democratic-presidential-candidate-was-mentioned-most-in-the-news-last-week-9/
https://fivethirtyeight.com/features/biden-may-not-have-won-the-debate-but-he-still-dominates-media-coverage/
https://fivethirtyeight.com/features/biden-already-dominated-cable-news-coverage-then-the-ukraine-story-broke/
https://fivethirtyeight.com/features/the-media-mentioned-biden-more-than-all-the-2020-primary-candidates-combined-last-week/
Oct:
https://fivethirtyeight.com/features/which-democratic-presidential-candidate-was-mentioned-most-in-the-news-last-week-10/
https://fivethirtyeight.com/features/warren-has-recently-been-mentioned-more-on-fox-news-than-other-networks/
https://fivethirtyeight.com/features/the-media-frenzy-around-biden-is-fading/
Nov:
https://www.realclearpolitics.com/articles/2019/11/26/bloomberg_buttigieg_rise_toward_the_top_in_media_mentions_141815.html

https://vocal.media/theSwamp/a-visual-history-of-the-yang-media-blackout