Kate walks into Toby's office and asks him if he thinks Santos has a chance against Vinick. Toby thinks not. Kate closes the door behind her and tells Toby that the leak did not come from NASA: "Too many of the technical details were off." Leo wonders why she closed the door to tell him that. She tells him that the FBI is pretty sure that the leak came from the West Wing: "They have a theory. One you're not gonna like."
At the convention, Abbey fusses over Jed's suit and asks him if he's okay. He tells her he is, "really." There is a tear in his eye, however. You can hear a speaker in the background introducing him. Abbey kisses him, with a tear in her own eye, and sends him off to the podium. On the way, he runs into Leo. There's a great shot of the two of them, in profile, facing each other, but in different planes of the shot. After a second of artful standing around, Jed takes the podium. We see Donna watching the speech from the utterly wrecked Russell war room. Jed starts the speech, and the crowd starts chanting "Four more years! Four more years!" I think I hear some other folks chanting, "Eight years, not seven! Eight years, not seven!" But that may just have been my crappy reception. Jed doesn't actually seem to give a speech. Instead, after the chanting fades away, he just introduces "the next President and Vice-President of these United States, Matthew Vincente Santos and Leo Thomas McGarry." Back in the Russell war room, we see that Josh is having a beer with Donna and Will as they watch the speech. In the convention hall, the balloons drop. Again.
Cut to Vinick, watching the convention on television. He stands up, turns toward some faceless aides, and says, "Okay. Let's go win this thing."