I think Johnson got into briefing rooms with the white house, the CIA, and the Joint Chiefs, and realized that the maga games have the potential to spiral into world war 3. Death and destruction beyond anything humanity has ever seen.

And he started figuring out how to givern like an adult. McCarthy had already burned too many bridges with Dems. They hated him. Johnson was a fresh face and Dems were desperate for someone they could cut deals with.