PRESIDENTIAL second terms usually end in fail ure. Since 1900, only Teddy Roosevelt could boast of a second term that was as good or better than his first. Woodrow Wilson lost Congress, then couldn't bring America into the League of Nations. FDR, whose third term was a success, failed to pass anything in his second after he alienated Congress by trying to pack the Supreme Court and purge recalcitrant Democrats. Harry Truman's popularity plunged over Korea, as Lyndon Johnson's did over Vietnam. Ike had two recessions and a hospitalization. Richard Nixon resigned. Ronald Reagan had Iran-Contra, and Bill Clinton was...