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Follows a group of advisers to the United States president. They attempt to help run the country while keeping their personal and public lives separate.
20 Hours in America (Part 1): Josh, Toby and Donna are stranded in Unionville, Indiana (S4 Ep1)
20 Hours in America (Part 2): Sam tends to the President in Josh's absence (S4 Ep2)
Toby and Josh consider a way to help people pay for college tuition (S4 Ep3)
Bartlet mulls the potential consequences of ordering a raid on domestic terrorists in Idaho (S4 Ep4)
Bartlet learns of an Israeli air attack that threatens to cause havoc in the Middle East (S4 Ep5)
Bartlet rehearses for his debate with his Republican rival, Governor Robert Ritchie (S4 Ep6)
Bartlet and his staff begin counting exit polls across the country (S4 Ep7)
The outcome of a Californian congressional race forces Sam to consider his position (S4 Ep8)
The Iranian Ayatollah wants his son to be flown to the US for life-saving surgery (S4 Ep9)
CJ clashes with a reporter who's not happy about their new press room seat assignment (S4 Ep10)
Bartlet begins to feel the weight of Shareef's assassination on his conscience (S4 Ep11)
Danny gets closer to the truth about what happened to Shareef (S4 Ep12)
CJ returns home to Dayton, Ohio to speak at her 20th high school class reunion (S4 Ep13)
Inauguration (Part 1): An international incident forces Bartlet to rewrite his address to the nation (S4 Ep14)
Inauguration (Part 2): The White House cancels Bartlet's speech and moves closer to military action (S4 Ep15)
The California 47th: Bartlet and his staff debate announcing a controversial tax plan (S4 Ep16)
The President waits tensely for the results of a military strike in Africa (S4 Ep17)
A furious Abbey approaches Amy for help to defeat an anti-abortion bill (S4 Ep18)
A cockpit warning light indicates that there may be a problem on Air Force One (S4 Ep19)
The staff are locked down after a gunman fires at the White House (S4 Ep20)
A press leak uncovers a scandal that affects the uppermost levels of the administration (S4 Ep21)
The US is placed on a heightened state of alert after suspected terrorists go missing (S4 Ep22) - Violent scenes
Twenty Five: The President confronts a national crisis that forces him to shut down Washington DC (S4 Ep23) - Violent scenes