Martin Sheen President Josiah "Jed" Bartlet Actor Bradley Whitford Dep. Chief of Staff Josh Lyman Actor John Spencer Chief of Staff Leo McGarry Actor Richard Schiff Communications Dir. Toby Ziegler Actor Allison Janney Press Secretary Claudia Jean "C.J." Cregg Actor Dulé Hill Charlie Young Actor Janel Moloney Donna Moss Actor Stockard Channing Abigail "Abbey" Bartlet Actor William Devane Secretary of State Lewis Berryhill Guest Star Mary-Louise Parker Amy Gardner Guest Star Jesse Bradford Ryan Pierce Guest Star Joshua Malina Will Bailey Guest Star Lily Tomlin Deborah Fiderer Guest Star NiCole Robinson Margaret Guest Star Michael O'Neill Secret Service Agent Ron Butterfield Guest Star Elisabeth Moss Zoey Bartlet Guest Star Gary Cole Vice President Bob Russell Guest Star Kris Murphy Katie Witt Guest Star Steven Culp Speaker of the House Jeff Haffley Guest Star Geoff Pierson Senate Minority Leader Tripplehorn Guest Star H. Richard Greene Senator Robert Royce Guest Star John Wells Executive Producer