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
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
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
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
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