Vietnam enemy inflitration through Laos and Cambodia and pros and cons of U.S. invasion to cut supply lines; Bunker's conviction concerning censorship of the press; LBJ's 3/31/1968 decision not to seek re-election; bombing pause; U.S. plans to train South Vietnamese and then pull U.S. troops; peace talks in Paris; South Vietnamese preference over HHH in 1968 election; economic, military and U.S. coverage of Tet offensive and Vietnam War in general; Bunker's press relations