If you thought you were living through a particularly nasty presidential primary, turns out you were right. Four years, ago, just 6 percent of campaign advertising in the GOP primary amounted to attacks on other Republicans, a figure that has shot up to over 50 percent in this election, according to Kantar Media/CMAG, an ad-tracking firm. Read full article > >

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Study: Negative campaign ads much more frequent, vicious than in primaries past