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 Alan Alda Senator Arnold Vinick Guest Star Jimmy Smits Matthew Santos Guest Star Teri Polo Helen Santos Guest Star Ron Silver Bruno Gianelli Guest Star Stephen Root Bob Mayer Guest Star J.K. Simmons Harry Ravitch Guest Star Michael Chieffo Hayes Guest Star Kristin Chenoweth Annabeth Schott Guest Star Matthew Del Negro Bram Howard Guest Star Renee Estevez Nancy Guest Star John Wells Executive Producer