This episode's headline: Impeachment Trial Preview; Ready for War; Long-Term Care; Unborn Child Abuse. ANCHOR: JIM LEHRER; GUESTS: SEN. JOSEPH LIEBERMAN, [D] Connecticut; SEN. ROBERT BENNETT, [R] Utah; SEN. ARLEN SPECTER, [R] Pennsylvania; SEN. JOHN BREAUX, [D] Louisiana; SUSAN DENTZER; CORRESPONDENTS: ELIZABETH FARNSWORTH; MARGARET WARNER; TOM BEARDEN; ELIZABETH BRACKETT; PHIL PONCE; TERENCE SMITH