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Pro-Gingrich Super PAC: Romney is '2nd most dangerous man in America'

obtained by NBC News

MASON CITY, Iowa – The Strong America Now Super PAC is sending direct mail pieces to Iowans this week in support of Newt Gingrich while attacking Mitt Romney – something the Gingrich campaign has vowed not to tolerate.

"Romney is the second most dangerous man in America and will perpetuate Obama's slide into financial crisis," one of at least two mailers from the Super PAC floating around the state reads. "Don't let Romney backers mislead you!" it continues.

"Newt Gingrich,” that same piece of literature reads, “Has the proven experience eliminating the deficit and making America prosperous."

obtained by NBC News

Another mailer from the Strong America Now Super PAC calls Gingrich "the right choice" and says he is the only candidate that has the track record to reduce the deficit. 

Romney, on the other hand, the ad reads, "has refused to sign a pledge to eliminate the deficit by the end of his first term in office… Romney's plan comes nowhere close to eliminating the federal deficit – at any point."

The former House Speaker has been very critical of Romney’s Super PAC, Restore Our Future, as it has been running endless negative television ads and mailing numerous anti-Gingrich campaign pieces.

Last Tuesday in Iowa, Gingrich even called on Romney to publicly demand his Super PACs only run positive ads.

"He can say that he condemns negative ads and I ask that PAC to run only positive ads. It is very simple. Anything short of that is bologna. We ought to understand these are his people, running his ads, doing his dirty work while he pretends to be above it," Gingrich said in Ottumwa, Iowa, on Dec. 20.

The Speaker's campaign would not comment on what seems to clearly be a pro-Gingrich Super PAC that is attacking Romney – one of the Strong America Now Super PAC mailers reads: "Newt Gingrich for president."

The purpose of the Strong America Now Super PAC mailers, according to the FEC website, is to support Gingrich and also "opposes Mitt Romney."

obtained by NBC News