Interesting study. Though now I would say Special Report has moved a little more left...as the network has moved that way
I think Fox started falling off the wagon when they started obsessing and giving wall to wall coverage over stories like Natalie Holloway. Yea, poor girl went missing and probably killed. Don’t need to hear about it 24/7. It started them down a path of hyper-analyzing every moment of ratings to see what drives the most viewers. Unfortunately it is tabloid, not deep politics.
Remember though in the equation that they did spin off Fox Business which is much more to the right. (yea they have libs but they are strong pro-capitalism).