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The percentage of negative political TV ads has increased sharply in the run up to the 2012 election. Ronald Reagan — revered by the Republican candidates — didn't air a single negative advertisement in his 1980 campaign for the presidency. George W. Bush's campaign didn't air any negative ads in 2000 either, nor did Democratic candidate Al Gore. Audie Cornish talks with John Geer, who tracks political advertising out of Vanderbilt University, about why the landscape has changed so drastically.