This episode's headline: Campaign for Kosovo; NewsMaker; Political Wrap; Prize Winner. ANCHOR: JIM LEHRER; GUESTS: TONY BLAIR, Prime Minister, Great Britain; MARK SHIELDS, Syndicated Columnist; PAUL GIGOT, Wall Street Journal; A. SCOTT BERG, Pulitzer Prize, Biography; CORRESPONDENTS: TOM BEARDEN; BETTY ANN BOWSER; TERENCE SMITH; PHIL PONCE; MARGARET WARNER; KWAME HOLMAN; PHIL PONCE; ELIZABETH FARNSWORTH; JEFFREY KAYE; SPENCER MICHELS