Martin Sheen President Josiah "Jed" Bartlet Actor Stockard Channing Abigail "Abbey" Bartlet Actor John Spencer Chief of Staff Leo McGarry Actor Bradley Whitford Dep. Chief of Staff Josh Lyman Actor Allison Janney Press Secretary Claudia Jean "C.J." Cregg Actor Richard Schiff Communications Dir. Toby Ziegler Actor Dulé Hill Charlie Young Actor Janel Moloney Donna Moss Actor Joshua Malina Will Bailey Actor Mary McCormack Kate Harper Actor Roger Rees Lord John Marbury Guest Star Christopher Lloyd Professor Lawrence Lessig Guest Star NiCole Robinson Margaret Guest Star Jimmy Smits Matthew Santos Guest Star Kristin Chenoweth Annabeth Schott Guest Star Steve Ryan Secretary of Defense Miles Hutchinson Guest Star Peter James Smith Ed Guest Star Renee Estevez Nancy Guest Star John Wells Executive Producer