Rob Lowe Sam Seaborn Actor 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 Lily Tomlin Deborah Fiderer Guest Star NiCole Robinson Margaret Guest Star Kim Webster Ginger Guest Star John Amos Percy Fitzwallace Guest Star Anna Deavere Smith Nancy McNally Guest Star Ron Silver Bruno Gianelli Guest Star Allison Smith Mallory O'Brien Guest Star Kris Murphy Katie Witt Guest Star Peter James Smith Ed Guest Star Victor McCay Peter Guest Star Andrew McFarlane Anthony Marcus Guest Star John P. Connolly Matt Kelley Guest Star Amy Adams Cathy Guest Star Renee Estevez Nancy Guest Star Aaron Sorkin Executive Producer Thomas Schlamme Executive Producer John Wells Executive Producer