This episode's headline: Family Feud; Saving the Lake; Conversation - Closing the Circle. ANCHOR: JIM LEHRER; GUESTS: REP. MARGE ROUKEMA, [R] New Jersey; REP. MATT SALMON, [R] Arizona; FORMER REP. BOB WALKER, [R] Pennsylvania; NATAN SHARANSKY; CORRESPONDENTS: KWAME HOLMAN; MARGARET WARNER; SPENCER MICHELS; CHARLES KRAUSE;