The below chart from the attached pdf shows how fox news changes republican view points on various topics. A couple that jump out at me are 1) the tax plan, 2) emergency, 3) "done more than anyone else in history, 4) the viewers vs. non viewers still voted for republican and still believe they are conservatives, 5) There was around a 15 point bump for non-republicans whether they were a viewer or not.
https://navigatorresearch.org/...s-Memo-F03.19.19.pdf
https://navigatorresearch.org/...s-Memo-F03.19.19.pdf