This episode's headline: Heading South; The First 100 Days; Shrinking Government; Historic Change?. The guests include JOHN PURCELL, Salomon Brothers; BILL ORME, Committee to Protect Journalists; PRESIDENT CLINTON; DONNA SHALALA, Secretary, Health and Human Services; MICHAEL BESCHLOSS, Presidential Historian; WILLIAM BENNETT, Former Reagan/Bush Cabinet Official; DORIS KEARNS GOODWIN, Presidential Historian; HAYNES JOHNSON, Journalist; CORRESPONDENT: TOM BEARDEN. Byline: In New York: ROBERT MAC NEIL; In Washington: JAMES LEHRER