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 Mel Harris Ricky Rafferty Guest Star Mark Feuerstein Clifford Calley Guest Star Lily Tomlin Deborah Fiderer Guest Star NiCole Robinson Margaret Guest Star Sam Robards Greg Brock Guest Star Jimmy Smits Matthew Santos Guest Star Kristin Chenoweth Annabeth Schott Guest Star Evan Arnold Ned Guest Star Karis Campbell Ronna Guest Star Alan Alda Actor Mary-Louise Parker Actor Rob Lowe Actor Moira Kelly Actor Janeane Garofalo Actor Teri Polo Actor John Wells Executive Producer Alex Graves Director Christopher Misiano Director Aaron Sorkin Writer Debora Cahn Writer Josh Singer Writer Thomas Schlamme Producer