Because Fox is the primary "mainstream" news source for conservative viewers. There are many more left-leaning news networks so their viewers are more divided. The majority of remaining news channels/networks/etc. have liberal bias.
Viewers have various options to choose from (eg CNN, MSNBC, Fox, Newsmax, ...). The divion CNN+MSNBC vs Fox (in terms of, say, viewership or ad revenue) seems to be roughly comparable to what you'd expect from voter demographics.
If, say, Newsmax rose to prominence and we'd see more fragmentation on the 'right', or CNN and MSNBC were to merge, and we'd see less fragmentation on the 'left', what would that change?
Just looking at the "AllSides Media Bias Chart" there are more "major" sources that are left-leaning than right [0]. The chart includes top sources by traffic. I mean this doesn't calculate all traffic and determine if in general left sources are more viewed but it's a start.
cygx|5 years ago
If, say, Newsmax rose to prominence and we'd see more fragmentation on the 'right', or CNN and MSNBC were to merge, and we'd see less fragmentation on the 'left', what would that change?
kuzimoto|5 years ago
[0] https://www.allsides.com/media-bias/media-bias-chart