I think the Overton window has been shifted so much in political media that it's disconnected from what "mainstream" is. It seems like the simplest answer given

I think the Overton window has been shifted so much in political media that it's disconnected from what "mainstream" is. It seems like the simplest answer given the overwhelming corporate pandering to left leaning causes over the last few years - the corporations have more actionable numbers and are following the money when forced to choose a side. The media is just a decade or two behind on their targeting.