This episode's headline: Grading Schools; No Pass - No Drive; Pressing Issues; Conversation - Opening Words. ANCHOR: JIM LEHRER; GUESTS: DORIS KEARNS GOODWIN, Presidential Historian; EDWARD M. FOUHY, Pew Center for Civic Journalism; HAYNES JOHNSON, Journalist/Author;PAUL McMASTERS, The Freedom Forum; MILLER WILLIAMS, Inaugural Poet; CORRESPONDENTS: MARGARET WARNER; ELIZABETH BRACKETT; ELIZABETH FARNSWORTH;