This episode's headline: Farm Bill Veto; Cuts in Public Housing; Abortion Clinic Violence: Update. The guests include In Washington: SAMUEL PIERCE, Secretary of Housing and; Urban Development; BARRY ZIGAS, National Low Income; Housing Coalition; JAMES ROUSE, The Enterprise Foundation; Reports from NewsHour Correspondents: ALISTAIR CLARKE (Visnews), in Egypt; ELIZABETH BRACKETT, in Chicago. Byline: In New York: ROBERT MacNEIL, Executive Editor; In Washington: JIM LEHRER, Associate Editor