This episode's headline: Shutdon; Tracking AIDS; Lifting the Cap; Labor Pains. ANCHOR: JIM LEHRER; GUESTS: SEN. PATRICK LEAHY; SEN. JOHN KYL; DR. RONALD VALDISERRI; PHILLWILSON; CHARLES HECKSCHER; JONATHAN TASINI; CORRESPONDENTS: KWAME HOLMAN; RAY SUAREZ; SPENCER MICHELS; MARGARET WARNER; GWEN IFILL; TERENCE SMITH; KWAME HOLMAN