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.

The President has a showdown; Donna lies when she appears before the Congressional committee investigating the President; Leo debates with an old friend about the US future stance regarding the war crimes tribunal; Sam tries to find the logic in a Congressman's proposed legislation to eliminate the penny.

Leo fears the worst when he testifies in the congressional investigation into Bartlet's lack of public disclosure about his illness.

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.

A new candidate for president, Senator Rafferty, has garnered much media attention with a ground-breaking speech about health care. But her words contain interesting echoes of President Bartlet's original health plan, which is known only to White House insiders, and reporter Greg Brock suspects that Rafferty is being secretly supported by the incumbent. Meanwhile, Toby is more than usually morose after the death of his brother. A bill to combat drought conditions in the western U.S. gives C.J. problems, particularly in dealing with lobbyist Clifford Calley. And Charlie tells Kate Harper that a man from his gym asked if she was dating anyone.

Santos engineers a plot to get a stalled stem-cell bill scheduled for a vote in the House. President Bartlet has an uncomfortable reunion with a rival economist with whom he split the Nobel Prize. A group of underage kids tries to convince Toby they deserve the right to vote. Kate tries to resolve a silly border dispute with Canada before there is bloodshed.

New rumors about Fidel Castro's health cause the President to re-examine the economic sanctions against Cuba that haven't worked for 40 years, and he sends Leo McGarry to meet secretly with the Cuban dictator. The occasion causes C.J. to check into Kate Harper's past with the C.I.A., but she is unaware of a past encounter between Kate and Leo. Meanwhile, Charlie discovers the complexities of dealing with a termite invasion of the White House.