A new ad airing today in the run-up to the April 3 Wisconsin primary replays footage of Rick Santorum saying he doesn’t “care what the unemployment rate’s going to be” and accuses him of voting against national right- to-work legislation.

It’s the latest attack spot sponsored by Restore Our Future, a so-called super-political action committee supporting Mitt Romney, aimed at derailing Santorum’s candidacy in Wisconsin by running more than 1,884 attack ads that the former Pennsylvania senator’s campaign says are misleading.

The commercial fits a pattern that has become a defining feature of the 2012 Republican presidential primary race. Since the contests began, Restore Our Future has spent $35 million on commercials attacking Santorum and Newt Gingrich, the former U.S. House speaker, the two candidates who have come closest to knocking Romney out of front-runner status, according to the Washington-based Center for Responsive Politics, which tracks political money. The super-PAC has spent just $1.1 million promoting Romney, the data shows.

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