Martin Sheen (Josiah Bartlet), Rob Lowe (Sam Seaborn), Allison Janney (C.J. Cregg), Richard Schiff (Toby Ziegler), Moira Kelly (Mandy Hampton), John Spencer (Leo McGarry), Bradley Whitford (Josh Lyman) more..., Dulé Hill (Charlie Young), Janel Moloney (Donna Moss), Joshua Malina (Will Bailey), Alan Alda (Arnold Vinick), Jimmy Smits (Matthew Santos), Stockard Channing (Abigail 'Abbey' Bartlet), Kristin Chenoweth (Annabeth Schott), Mary McCormack (Kate Harper)

Aaron Sorkin (Executive Producer), John Wells (Executive Producer), Kristin Harms (Producer), W.G. Snuffy Walden (Original Music Composer), Neal Ahern Jr. (Producer), Alex Graves (Co-Executive Producer), Christopher Misiano (Co-Executive Producer) more..., Kevin Falls (Co-Executive Producer), Thomas Schlamme (Executive Producer), Paul Redford (Supervising Producer), Lawrence O'Donnell (Consulting Producer), Patrick Ward (Co-Producer), Andrew Stearn (Producer), Eli Attie (Supervising Producer), Debora Cahn (Producer), Peter Noah (Executive Producer), Lawrence O'Donnell (Executive Producer), Patrick Ward (Producer), Alex Graves (Executive Producer), Michael Hissrich (Producer), Christopher Misiano (Executive Producer), Michael Hissrich (Co-Producer), Llewellyn Wells (Producer), Paul Redford (Co-Producer), Peter Parnell (Co-Producer), Christopher Misiano (Supervising Producer), Patrick Ward (Associate Producer), Neal Ahern Jr. (Co-Producer), Llewellyn Wells (Co-Executive Producer), Eli Attie (Producer), Peter Noah (Supervising Producer), Carol Flint (Supervising Producer), John Sacret Young (Supervising Producer), Laura Schiff (Casting), John Frank Levey (Original Casting), Kevin Scott (Original Casting), Kevin Scott (Casting), John Frank Levey (Casting), Anthony Sepulveda (Casting),