From the 2004 election cycle through March 31, 2014, Kantar Media’s Campaign Media Analysis Group has classified more than 50,000 TV ads in races for president on down to local office. This figure excludes the thousands of ballot initiative ads, non-election issue ads, and pre-2004 campaign ads we’ve also classified. Even without them, this interactive “Eye” created by CMAG’s Harley Ellenberger showing the past decade in campaign TV advertising is the largest compilation of political ads ever assembled. CONT.
Elizabeth Wilner (Kantar Media), Cook Political Report