Senator Robert McCallister

Robert McCallister is a poised, principled California senator whose orbit collides with the sprawling, loudly Democratic Walker family through his relationship with Kitty. Older, polished, and used to controlling a room, he brings a politician's discipline and a genuine tenderness to a household that runs on noise, opinion, and old grudges.

Rob Lowe plays him with a smoothness that could easily read as calculation but instead lands as sincerity hard-won through experience. The show uses his political life to test his private decency against public pressure, and Lowe's control—steady voice, careful stillness—makes every crack in that composure feel earned rather than melodramatic.