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 Nina Siemaszko Ellie Bartlet Actor Cherry Jones Barbara Layton Guest Star Michael Gaston Eric Hayden Guest Star Lily Tomlin Deborah Fiderer Guest Star NiCole Robinson Margaret Guest Star Melissa Marsala Rina Guest Star Gary Cole Vice President Bob Russell Guest Star Joshua Malina Will Bailey Guest Star John Wells Executive Producer Llewellyn Wells Director Alexa Junge Writer Josh Singer Writer Debora Cahn Writer