There’s a few investigations into why Talk Radio became such a Republican dominated market, but I don’t have a good link. They also ignored how NPR fills a similar niche and leans left. But overall I setup a spreadsheet and ran the numbers on viewership vs scores on sites like:

https://mediabiasfactcheck.com/ Fox: FOX: 6.7, CNN -3.7, another site giving them 4 vs -2 etc.

Then used numbers from sites like https://www.adweek.com/tvnewser/first-quarter-2025-cable-new...

So for most watched cable news show you get FOX 4,552k viewers vs CNN 558k viewers. Multiply and you get a rather shockingly different impact.