> Fox and Breitbart have both lost key leaders due to death. (and other causes) They are both rapidly transitioning to the views of typical reporters (journalism majors), which will soon put them on the left.
Viewpoints are set by media owners, not line workers, and the entire corporate media has a corporatist conservative pro-capital bias.
To the extent that ends up sometimes favoring Democrats, well, the dominant faction of the Democratic Party for several decades (since the 1990s, at a minimum) has been corporate capitalist conservatives.
Anyhow, Fox and Breitbart aren't moving into the left or even getting closer to centerpoint of the mainstream corporate media; they just aren't moving further to the Right as fast as the Republican Party is.