The Koch foundation made a long-term investment in making it seem like grass roots movements were pushing society to the right. They kept it up for over twenty years, and that persistence has paid off for them in ways that will likely take a similar amount of time to reverse https://time.com/secret-origins-of-the-tea-party/

The difference in the size of left- and right-leaning media isn’t in news or comedy sites. The right-leaning news and comedy media is only modestly more watched than left-leaning media. Where the right really dominates is sliding politics into every single popular subject - topics like sports, games, wellness, and religion have tons of audience for right-leaning shows and basically no audience for left-leaning ones. https://www.mediamatters.org/google/right-dominates-online-media-ecosystem-seeping-sports-comedy-and-other-supposedly