I'm confused by this. Are you saying that everything related to the right wing and fox news is evidence that momentum is a good model or that trying to model history with momentum is fundamentally fallacious? If the former, you've really got to be more specific- was firing Tucker Carlson evidence for momentum somehow? Did Republicans conceding gay marriage or Trump conceding abortion give Democrats momentum?
Sorry for being confusing, I was saying the latter - that these are reducing history to some game that can be understand with rules when it is nothing like that.