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.

And the negative ads are not just more frequent — they also appear to be more vitriolic.

In 2008, one of harshest ads run by Mitt Romney ahead of the Iowa caucus criticized Sen. John McCain’s (R-Ariz.) position on immigration, but only after calling him “an honorable man.”

In 2012, such a nicety seems quaint.

Romney’s campaign began running an ad Friday in Michigan showing a limp body sinking in murky water, while a narrator intones: “America is drowning in national debt, yet Rick Santorum supported billions in earmarks.”

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