Season 3: 2001–2002
　　Cast: Rob Lowe, Stockard Channing, Dulé Hill, Allison Janney, Janel Moloney, Richard Schiff, John Spencer, Bradley Whitford and Martin Sheen
　　The third season, which covers the administration's third and fourth years in office, starts off with Bartlet announcing his intention to run for reelection and is heavily devoted to the upcoming presidential election. Other prominent plotlines include Congressional investigations into whether Bartlet committed electoral fraud by concealing his MS, a death threat against C.J. and the ensuing relationship she develops with a Secret Service agent assigned to her, the Qumari defense minister Abdul Shareef plotting terrorist attacks against the US, and a troubling meeting between Toby and the President that leaves Bartlet with a bout of insomnia in "Night Five." The season finale, "Posse Comitatus" closes several of these storylines as Bartlet meets his opponent in the elections and reaffirms his commitment to beat him. The episode ends with the president finally deciding to order Shareef's assassination (a legally questionable act) and C.J.'s agent's murder, just after the man threatening C.J. was caught.
　　From a critical perspective, series creator Aaron Sorkin acknowledged in October 2002 that the terrorism-related plots designed to keep the series relevant after the real-life 9/11 attacks were awkward at times, saying "from week to week, you felt like you were writing the show handcuffed, a little bit. I didn't know how to write it anymore. It was a constant search for what I wasn't doing that used to make the show work. [...] Maybe there was a way to make it work; there probably was. I wasn't able to find it in twenty-two episodes." [1] Nonetheless, the show went on to win its third "Outstanding Drama" Emmy in a row.

　　卡波立夫人（切莉尔·卡贝尔 Cheryl Campbell 饰）虽然表面看来风光的嫁入了豪门，但实际上一辈子都遭受着冷酷无情的丈夫的折磨，终于，丈夫去世了，卡波立夫人总算从痛苦不堪的生活中摆脱出来了。然而，虽然丈夫留下了数额庞大的遗产，但卡波立家的大儿子菲利克斯（马修·麦克费登 Matthew Macfadyen 饰）却是个不学无术只知道挥霍金钱的纨绔子弟，在菲利克斯挥金如土的习性影响下，卡波立家很快就被掏空了。
　　一天，一位名为保罗（希里安·墨菲 Cillian Murphy 饰）的商人来到了镇上，他的热情和阔绰让他很快就在当地声名远扬。玛丽（雪莉·亨德森 Shirley Henderson 饰）是保罗的女儿，菲利克斯情不自禁的爱上了她。

　　Joey begins her first day at Worthington University where she is struggling in her beginners writing class taught by Professor David Wilder who criticizes her first essay about her and Dawson. Audrey Liddell, Joey's brash new roommate from Beverly Hills, proves to be more of an annoyance than a friend with her wild and crazy personality. Dawson, who's continuing his studies at USC with an internship in Hollywood, begins his job on a shaky start when he meets Todd Carr, an arrogant, egocentric, hack film director who gives Dawson a hard time. Meanwhile, Jen pays Pacey a visit, who's lying low as he docks his yacht in Boston Harbor after sailing away the summer. At nearby Boston Bay College, Jen and Jack are invited to their first fraternity party. They persuade Joey to come along with Audrey who seems to get along with Jen and Jack, much to Joey's surprise. Also, Jen meets Charlie, a bass player. She is rude to him, insulting him away, but deep inside feels strongly attracted to him.

　　Doggett不顾众人的阻拦坚持调查，他开始着手调查一个环保署职员死亡的案件。