The story here is not complicated, at least in broad strokes. Mid-summer Delta, economic knock-on effects of Delta and finally Afghanistan started sapping Biden’s popularity. Manchin saw that ebbing power and started pumping the brakes on the President’s agenda. This was of a piece with DC insider culture, which Manchin is the ultimate creature of, turning hard on the President. The big reporters changing their view of him and the lobbies sensing weakness.
All political power is unitary and it’s played out over the last two or three months in a very damaging way.