Everything related to the right wing and fox news? We never had a big "swing left" - clinton was the democrats showing they can do economic conservatism as well. Modern acceptance of trans folks isn't a pendulum, most of the people espousing anti-trans views weren't pro trans 5 years ago.
Trying to abstract history into major shifts that are attributable to inanimate objects is just very ludic fallacy.
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?