'Super PAC' Backing Romney Airs Ad Aimed at Santorum February 14, 2012, 7:28 pm Restore Our Future, the "super PAC" backing Mitt Romney, has begun an assault on Rick Santorum in the wake of several national polls showing the two men now virtually tied heading into the next contests at the end of the month. In a new ad airing in Michigan and elsewhere, the group attacks Mr. Santorum for voting as a senator to raise the debt limit, increase spending, request earmarks and to let convicted felons vote. Rick Santorum. Big Spender. Washington Insider," the ad concludes. On Monday, Restore Our Future, which is run by several of Mr. Romney's former top aides, purchased an additional $460,000 in television time in Michigan as it prepared for the battle there with Mr. Santorum. In the last several months, the group has primarily aired negative ads that attack Mr. Romney's rivals. The group spent millions of dollars in Iowa, South Carolina and Florida to criticize Newt Gingrich's character and record. Now, that firepower is being turned on Mr. Santorum, who has struggled to raise the kind of money that could defend against the combined resources of Mr. Romney and the super PAC. There is a super PAC backing Mr. Santorum, too, but it has not raised or spent as much money as Restore Our Future.