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 Oliver Platt Oliver Babish Actor Kathryn Joosten Mrs. Landingham Actor Marlee Matlin Joey Lucas Guest Star Anna Deavere Smith Nancy McNally Guest Star John Rubinstein Sen. Andy Ritter Guest Star Peter Michael Goetz Paul Hackett Guest Star Richard McGonagle Sen. Warren Guest Star Robert Walden Sen. Rossiter Guest Star NiCole Robinson Margaret Guest Star Gregory Alan Williams Robbie Mosley Guest Star Victor McCay Peter Guest Star Glenn Morshower Mike Chysler Guest Star Bill O'Brien Kenny Thurman Guest Star Devika Parikh Bonnie Guest Star Kris Murphy Katie Witt Guest Star Aaron Sorkin Executive Producer, Writer Thomas Schlamme Executive Producer John Wells Executive Producer Kristin Harms Producer Llewellyn Wells Producer Robert Berlinger Director