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 Gary Cole Vice President Bob Russell Guest Star Mary-Louise Parker Amy Gardner Guest Star NiCole Robinson Margaret Guest Star Kim Webster Ginger Guest Star Benjamin Brown Mike Wayne Guest Star Ron Canada Under Secretary of State Theodore Barrow Guest Star Kris Murphy Katie Witt Guest Star Jesse Bradford Ryan Pierce Guest Star Joshua Malina Will Bailey Guest Star Peter James Smith Ed Guest Star John Wells Executive Producer