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 Emily Procter Ainsley Hayes Actor Ron Silver Bruno Gianelli Guest Star Connie Britton Connie Tate Guest Star Evan Handler Douglas Wegland Guest Star Mark Feuerstein Clifford Calley Guest Star Miguel Sandoval Victor Campos Guest Star NiCole Robinson Margaret Guest Star Nicholas Pryor Special Prosecutor Clement Rollins Guest Star Edmund L. Shaff Secretary of the Interior Bill Horton Guest Star Devika Parikh Bonnie Guest Star Kim Webster Ginger Guest Star Thom Barry Congressman Mark Richardson Guest Star Aaron Sorkin Executive Producer, Writer Thomas Schlamme Executive Producer John Wells Executive Producer Michael Hissrich Producer Alex Graves Producer, Director Kristin Harms Producer Llewellyn Wells Producer