This episode's headline: Covert Supplies?; Militia Groups - Drawing the Line; Judicious Choices; Conversation. ANCHOR: JIM LEHRER; GUESTS: REP. BENJAMIN GILMAN, [R) New York; REP. LEE HAMILTON, [D] Indiana; CLINT BOLICK, Institute for Justice; ANTHONY LEWIS, New York Times; FRANKLIN THOMAS, Former President, Ford Foundation; CORRESPONDENTS: ELIZABETH FARNSWORTH; ROD MINOTT; MARGARET WARNER; CHARLAYNE HUNTER-GAULT;