Snow-covered cars in a parking lot greet early morning risers in Madison, Wis. as a severe winter storm moves through the upper Midwest Thursday, Dec. 20, 2012. (AP Photo/Wisconsin State Journal, John Hart)

Associated Press
Snow-covered cars in a parking lot greet early morning risers in Madison, Wis. as a severe winter storm moves through the upper Midwest Thursday, Dec. 20, 2012. (AP Photo/Wisconsin State Journal, John Hart)
Snow-covered cars in a parking lot greet early morning risers in Madison, Wis. as a severe winter storm moves through the upper Midwest Thursday, Dec. 20, 2012. (AP Photo/Wisconsin State Journal, John Hart)
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