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 Tim Matheson Senator John Hoynes Actor Kathryn Joosten Mrs. Landingham Actor Joanna Gleason Atty. Jordon Kendall Guest Star Mark Feuerstein Clifford Calley Guest Star Clark Gregg FBI Special Agent Michael Casper Guest Star James Handy Rep. Joseph Bruno Guest Star Steven Gilborn Rep. Paul Dearborn Guest Star Doug Ballard Governor Edward Pratt Guest Star Todd Waring Rep. Rathburn Guest Star NiCole Robinson Margaret Guest Star Carlos Jacott N.H. Marketing Guy 2 Guest Star Randy Thompson CEO Donor 1 Guest Star Dennis Haskins CEO Donor 2 Guest Star Ellis Williams Reverend Algiss Skyler Guest Star Ashley Clark Alan Guest Star Aaron Sorkin Executive Producer, Writer Thomas Schlamme Executive Producer, Director John Wells Executive Producer Michael Hissrich Producer Alex Graves Producer Kristin Harms Producer Llewellyn Wells Producer