BBC North American editor Justin Webb introduces Alistair Cooke's famous Letters from America, broadcast during previous election campaigns over the past 60 years. Lyndon Johnson won a landslide victory in 1964 but faced continuing questions in 1966 because of the war in Vietnam. Alistair Cooke reflects on the changes in American democracy from the days when everyone knew their place to an age when people were demanding to know what was being done in their name.