Rick Santorum told voters in Mandeville, La. on Wednesday that they were "not looking for someone who's the Etch A Sketch candidate." Sean Gardner /Reuters /Landov hide caption

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Restore Our Future, the superPAC supporting Mitt Romney, is running negative ads about Newt Gingrich in Ohio ahead of Super Tuesday on March 6, 2012. Restore Our Future hide caption

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A camera is used instead of a rearview mirror on the Toyota NS4 plug-in hybrid concept car at the North American International Auto Show in Detroit on Jan. 10. Mike Cassese/Reuters/Landov hide caption

toggle caption Mike Cassese/Reuters/Landov

An image from a superPAC ad attacking Newt Gingrich, whose campaign called on TV stations to pull the ad off the air. Restore Our Future hide caption

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Rick Santorum and Mitt Romney took the stage in a January presidential debate in Florida. They'll meet again Wednesday night in Arizona, which holds its primary on Feb. 28, the same day as the crucial Michigan contest. Paul Sancya/AP hide caption

toggle caption Paul Sancya/AP

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