Rick Santorum signs Joe Boulus' apron at a Lenten fish fry Friday in Michigan. Mitt Romney is ahead of Santorum among Catholic voters in the state, despite the fact that Santorum is Catholic. Scott Olson/Getty Images hide caption

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This 1957 DeSoto Fireflite is on display at The Henry Ford Museum in Dearborn, Mich. Courtesy of The Henry Ford Museum hide caption

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A visitor looks at a Citroen diesel engine at the Geneva Motor Show in Switzerland in 2010. Diesel is popular in Europe but not the U.S.; now, automakers are giving the technology more consideration as a means to meet new fuel economy standards. Martin Meissner/AP hide caption

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Detroit Auto Show photographers sometimes mistake car designer Christine Park for a spokesmodel. "It's a very male-dominated field," she says, "so it's something that people don't expect." North American International Auto Show hide caption

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Ford's MyFord Touch interface allows users to manage phone calls, navigation, entertainment and the car's temperature through a touch screen on the dashboard. Stuart Ramson/AP hide caption

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The 2012 Dodge Dart is unveiled at the North American International Auto Show in Detroit on Monday. Tony Ding/AP hide caption

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Jonathan Browning, president of Volkswagen Group of America, attends the U.S. unveiling of the 2012 Volkswagen Beetle, a new version of the iconic car. Volkswagen saw a 26.3 percent increase in U.S. sales in 2011, and has its sights on becoming the world's No. 1 carmaker. Jamie McCarthy/Getty Images hide caption

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