The Special Prosecutor sets his probe in motion; Sam and Bruno are concerned about the loyalty of a powerful labor leader; Toby and Josh are preoccupied with a congressional battle over the estate tax; Ainsley fixes up Donna with a Republican.

Leo defiantly rejects the Congressional Oversight Committee's offer of a public censure of Bartlet that would finally bring an end to the investigation and spare Leo of any possible personal repercussions.

This documentary special interspersed clips from several episodes in the series with interviews of former occupants of the real West Wing, including Presidents Ford, Carter and Clinton and members of their staffs.

The 15-year old son of an Iranian leader needs a heart transplant in the U.S. Problem is, the only man who could do it is an enemy of the Iranian government; The Senate minority leader threatens to thwart the President's legislative agenda when he believes that Hoynes is doing some political maneuvering for the next Presidential election; Toby offers a Congresswoman a Cabinet position but is forced to take back the offer.

Josh, determined to make sure a foreign aid bill passes even though it's a hopeless cause, sends Donna out to track down a reluctant senator; in an attempt to impress Zoey's new boyfriend, Charlie unwittingly gets over his head with the Department of Defense; Danny continues to pursue the Shareef matter; a Bartlet photo op with Heifer International creates unexpected opportunities -- for C.J. to perfect her spin-doctoring techniques, and for the staff once again to test Will's mettle and sense of humor.

Air Force One is forced to keep aloft for almost 24 hours when an indicator light leads the flight crew to believe that the landing gear isn't functioning properly; Bartlet and Will have a spirited discussion on Colombian recertification, which is ultimately rendered moot when Air Force One doesn't land on time; the Black Caucus plays hardball with the Oval Office to gain a Congressional debate on the merits of reinstating the draft; legislation to clean up Chesapeake Bay is sacrificed to partisan politics; Will is unsuccessful in hiding his fear of flying from C.J. and Charlie; deaths in Kundu continue to mount.

The White House is locked down after a gunman on the street fires shots into the West Wing; Josh interviews a candidate to replace Ainsley Hayes; Bartlet negotiates for the return of a spy plane is forced down over Russia; the staff plays poker.

Will Bailey receives an offer to become Vice President Russell's top aide. Amy Gardner does some skillful lobbying for domestic violence prevention which gets the wrath of Bartlet. A conservative democratic senator switches parties.

Toby gets Jed's support to seize a controversial window of opportunity to save Social Security, but is hampered by Jed's mandate to keep the operation under wraps; desperate to feed the press corps beast on a glacially slow news day, C.J. meets with an attache to discuss cabbage imports, and has a little fun with a particularly dense reporter; Josh's brainstorm to help Will burnish Bob Russell's presentation problems and a persistent reporter endanger Toby's attempts to broker a deal on the Hill; Rina finds a friend in Donna, and Josh isn't too happy about it; Toby is saved from having to fall on his sword when Josh and Jed devise a plan to rescue his deal from certain disaster.

Hail the conquering hero. Josh returns after nailing down details for a trade agreement. But the devil in the detail, including information kept from Josh. C.J. fights megamedia ownership of local TV.

Leo is rushed into bypass surgery after suffering a massive heart attack; as Toby and Josh scramble chaotically to get votes after Haffley demands Democratic support for a tax cut in exchange for ratification of the peace plan, it becomes quickly apparent that Jed must overcome his reluctance to name a new chief of staff; C.J. works with the State Department on getting U.N. and NATO approval of the peace accord; Charlie drags his feet about completing some minor graduation requirements because he's reluctant to keep his promise that he'll resign as Jed's body man to seek a better position once he has his degree; Donna returns to work; C.J. gets on Josh's case about his unhealthy diet.

Santos starts up his presidential campaign in New Hampshire, where he immediately disagrees with Josh on campaign philosophy: "No opposition research, no dirt on our opponents." Josh has an uncomfortable reunion with Russell campaign staffer Donna.

It's five days before the New Hampshire primary, and Josh is desperately trying to find a "silver bullet" that will get his candidate into the local debate between the two front-runners, Vice President Russell and former Vice President Hoynes. Then, Josh and Santos's disagreements over how to run the campaign come to a head when Santos hires Josh's ex-girlfriend Amy Gardner to help him prepare for the debate he may never be in. And Donna has a memorable encounter with a chicken.

Santos is campaigning in California during the last few days before the all-important "Super Tuesday" primary elections, but he is out of money and he trails both Russell and Hoynes in the polls. When even "La Palabra", a Latino voters group, is all set to endorse Hoynes instead of Santos, Josh urges Santos to take a stand on the new bill that denies driver's licenses to illegal immigrants. Meanwhile, Donna tries to figure out why Hoynes suddenly isn't campaigning in California, and advances her position in the Russell campaign by becoming the Vice President's official spokesperson.

Santos and Vinick have to deal with press fallout when it looks like the Bartlet White House is not going to continue the investigation into the press leaks.

Donna is back and she's working for the Santos/McGarry campaign, but not for Josh. An attack ad on Santos by a pro-life group puts Vinick in a corner when Santos demands Vinick renounce it but Vinick knows that if he does it will offend the G.O.P. leadership.

Bartlet must deal with the possiblity of a nuclear explosion in California, Kate is keeping a careful watch on the election in Kazakhstan and China's response, Will is acting as the government's voice this week, and Josh is trying to keep his political version of Tourette's in check.

Abbey is in New Hamphire with Liz Bartlet-Westin and they are awaiting the results of Doug Westin's campaign for a seat in Congress. Members of both the Santos campaign and the Vinick campaign must decide how to handle a tragedy, as the voters around the country continue to cast their votes for the next President of the United States.

Former series regulars, including Marlee Matlin, Mary-Louise Parker, Tim Matheson, Anna Deavere Smith and Gary Cole, make guest appearances as Bartlet, Santos and their staff members attend a funeral for one of their own. Also, Josh cautions Santos about getting involved in the vote for Speaker of the House.