This episode's headline: Farm Bill; Helping the Homeless?. The guests include In Chicago: ORION SAMUELSON, Farm Reporter; In New York: EDWARD KOCH, Mayor of New York; NORMAN SIEGEL, New York Civil Liberties Union; In Boston: Rep. BARNEY FRANK, Democrat, Massachusetts; In Washington: JUNE KOCH, Assistant Secretary of HUD; Reports from NewsHour Correspondents: MICHAEL BUERK (BBC), in South Africa; JUNE MASSELL, in New York; MARILYN DEUTSCH (KOAP), in Portland, Oregon. Byline: In New York: CHARLAYNE HUNTER-GAULT, Correspondent; In Washington: JIM LEHRER, Associate Editor; JUDY WOODRUFF, Correspondent