The 18DoughtyStreet.com and BritainAndAmerica.com ad depicting A World Without America was the most discussed ad on YouTube yesterday. 125,000 people have viewed it on YouTube already and well over 20,000 people have watched it on 18 Doughty Street. Thanks to 'DarthProphet' you can watch Tim Montgomerie's appearance on Fox News yesterday when he discussed the ad (click on the video below). Tim is a Director of 18 Doughty Street and edits BritainAndAmerica.com. Members of the Doughty Street team discuss the video's impact in this 15 minute edition of the Campaign HQ programme.