For fans of Mad Men it will prove difficult to learn of the story behind 'Peace, Little Girl' - a brutal 60 second television spot which first aired on September 7, 1964 - and not imagine the offices of Sterling Cooper. The ad was conceived by agency Doyle Dane Bernbach on behalf of President Lyndon Johnson, in an effort to kill off Republican candidate Barry Goldwater's march to the White House. DDB, desperate for success with their first political client, threw 40 of their best men at the campaign and chose to aim for the jugular by capitalising on comments Goldwater had previously made concerning nuclear weapons. The following letter was written by DDB co-founder and legendary ad-man Bill Bernbach just months before the election, at a time when Goldwater had managed to regain the public's confidence and the DNC had started to drag their heels. - Seth Anderson