A Clinton aide asks why presidents don't learn that full candor is always the best policy Two recent television docudramas suggest lessons for how leaders can level with the public in a time of war. In one, Winston Churchill told citizens the truth about security lapses leading up to World War II. In the other, President Lyndon Johnson-certain that voters would not tolerate bad news from Vietnam-hid the true cost and trajectory of that war. PERHAPS THE BUSH WHITE HOUSE was watching the wrong one. The long-hidden warnings, given to George W. Bush, of possible Al Qaeda hijackings last summer...