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Detroit Mayor Dave Bing takes members of the media on a tour of Cobo Center during the final hours of construction at the 2013 North American International Auto Show on January 10, 2013. (credit: George Fox/CBS 62)

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Detroit Mayor Dave Bing takes members of the media on a tour of Cobo Center during the final hours of construction at the 2013 North American International Auto Show on January 10, 2013. (credit: George Fox/CBS 62)

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Detroit Mayor Dave Bing takes members of the media on a tour of Cobo Center during the final hours of construction at the 2013 North American International Auto Show on January 10, 2013. (credit: George Fox/CBS 62)

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Detroit Mayor Dave Bing takes members of the media on a tour of Cobo Center during the final hours of construction at the 2013 North American International Auto Show on January 10, 2013. (credit: George Fox/CBS 62)

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Detroit Mayor Dave Bing takes members of the media on a tour of Cobo Center during the final hours of construction at the 2013 North American International Auto Show on January 10, 2013. (credit: George Fox/CBS 62)

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Detroit Mayor Dave Bing takes members of the media on a tour of Cobo Center during the final hours of construction at the 2013 North American International Auto Show on January 10, 2013. (credit: George Fox/CBS 62)

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Detroit Mayor Dave Bing takes members of the media on a tour of Cobo Center during the final hours of construction at the 2013 North American International Auto Show on January 10, 2013. (credit: George Fox/CBS 62)

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Detroit Mayor Dave Bing takes members of the media on a tour of Cobo Center during the final hours of construction at the 2013 North American International Auto Show on January 10, 2013. (credit: George Fox/CBS 62)

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Detroit Mayor Dave Bing takes members of the media on a tour of Cobo Center during the final hours of construction at the 2013 North American International Auto Show on January 10, 2013. (credit: George Fox/CBS 62)

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Detroit Mayor Dave Bing takes members of the media on a tour of Cobo Center during the final hours of construction at the 2013 North American International Auto Show on January 10, 2013. (credit: George Fox/CBS 62)

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Detroit Mayor Dave Bing takes members of the media on a tour of Cobo Center during the final hours of construction at the 2013 North American International Auto Show on January 10, 2013. (credit: George Fox/CBS 62)

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Detroit Mayor Dave Bing takes members of the media on a tour of Cobo Center during the final hours of construction at the 2013 North American International Auto Show on January 10, 2013. (credit: George Fox/CBS 62)

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Detroit Mayor Dave Bing takes members of the media on a tour of Cobo Center during the final hours of construction at the 2013 North American International Auto Show on January 10, 2013. (credit: George Fox/CBS 62)

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Detroit Mayor Dave Bing takes members of the media on a tour of Cobo Center during the final hours of construction at the 2013 North American International Auto Show on January 10, 2013. (credit: George Fox/CBS 62)

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Detroit Mayor Dave Bing takes members of the media on a tour of Cobo Center during the final hours of construction at the 2013 North American International Auto Show on January 10, 2013. (credit: George Fox/CBS 62)

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Detroit Mayor Dave Bing takes members of the media on a tour of Cobo Center during the final hours of construction at the 2013 North American International Auto Show on January 10, 2013. (credit: George Fox/CBS 62)

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Detroit Mayor Dave Bing takes members of the media on a tour of Cobo Center during the final hours of construction at the 2013 North American International Auto Show on January 10, 2013. (credit: George Fox/CBS 62)

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Detroit Mayor Dave Bing takes members of the media on a tour of Cobo Center during the final hours of construction at the 2013 North American International Auto Show on January 10, 2013. (credit: George Fox/CBS 62)

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Detroit Mayor Dave Bing takes members of the media on a tour of Cobo Center during the final hours of construction at the 2013 North American International Auto Show on January 10, 2013. (credit: George Fox/CBS 62)

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Detroit Mayor Dave Bing takes members of the media on a tour of Cobo Center during the final hours of construction at the 2013 North American International Auto Show on January 10, 2013. (credit: George Fox/CBS 62)

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Detroit Mayor Dave Bing takes members of the media on a tour of Cobo Center during the final hours of construction at the 2013 North American International Auto Show on January 10, 2013. (credit: George Fox/CBS 62)

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Detroit Mayor Dave Bing takes members of the media on a tour of Cobo Center during the final hours of construction at the 2013 North American International Auto Show on January 10, 2013. (credit: George Fox/CBS 62)

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Detroit Mayor Dave Bing takes members of the media on a tour of Cobo Center during the final hours of construction at the 2013 North American International Auto Show on January 10, 2013. (credit: George Fox/CBS 62)

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Detroit Mayor Dave Bing takes members of the media on a tour of Cobo Center during the final hours of construction at the 2013 North American International Auto Show on January 10, 2013. (credit: George Fox/CBS 62)

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Detroit Mayor Dave Bing takes members of the media on a tour of Cobo Center during the final hours of construction at the 2013 North American International Auto Show on January 10, 2013. (credit: George Fox/CBS 62)

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Detroit Mayor Dave Bing takes members of the media on a tour of Cobo Center during the final hours of construction at the 2013 North American International Auto Show on January 10, 2013. (credit: George Fox/CBS 62)

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(credit: George Fox/CBS 62)

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Detroit Mayor Dave Bing takes members of the media on a tour of Cobo Center during the final hours of construction at the 2013 North American International Auto Show on January 10, 2013. (credit: George Fox/CBS 62)

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Detroit Mayor Dave Bing takes members of the media on a tour of Cobo Center during the final hours of construction at the 2013 North American International Auto Show on January 10, 2013. (credit: George Fox/CBS 62)

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Detroit Mayor Dave Bing takes members of the media on a tour of Cobo Center during the final hours of construction at the 2013 North American International Auto Show on January 10, 2013. (credit: George Fox/CBS 62)

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Detroit Mayor Dave Bing takes members of the media on a tour of Cobo Center during the final hours of construction at the 2013 North American International Auto Show on January 10, 2013. (credit: George Fox/CBS 62)

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Detroit Mayor Dave Bing takes members of the media on a tour of Cobo Center during the final hours of construction at the 2013 North American International Auto Show on January 10, 2013. (credit: George Fox/CBS 62)

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Detroit Mayor Dave Bing takes members of the media on a tour of Cobo Center during the final hours of construction at the 2013 North American International Auto Show on January 10, 2013. (credit: George Fox/CBS 62)

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Detroit Mayor Dave Bing takes members of the media on a tour of Cobo Center during the final hours of construction at the 2013 North American International Auto Show on January 10, 2013. (credit: George Fox/CBS 62)

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Detroit Mayor Dave Bing takes members of the media on a tour of Cobo Center during the final hours of construction at the 2013 North American International Auto Show on January 10, 2013. (credit: George Fox/CBS 62)

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Detroit Mayor Dave Bing takes members of the media on a tour of Cobo Center during the final hours of construction at the 2013 North American International Auto Show on January 10, 2013. (credit: George Fox/CBS 62)

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Detroit Mayor Dave Bing takes members of the media on a tour of Cobo Center during the final hours of construction at the 2013 North American International Auto Show on January 10, 2013. (credit: George Fox/CBS 62)

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Detroit Mayor Dave Bing takes members of the media on a tour of Cobo Center during the final hours of construction at the 2013 North American International Auto Show on January 10, 2013. (credit: George Fox/CBS 62)

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Detroit Mayor Dave Bing takes members of the media on a tour of Cobo Center during the final hours of construction at the 2013 North American International Auto Show on January 10, 2013. (credit: George Fox/CBS 62)

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Detroit Mayor Dave Bing takes members of the media on a tour of Cobo Center during the final hours of construction at the 2013 North American International Auto Show on January 10, 2013. (credit: George Fox/CBS 62)

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Detroit Mayor Dave Bing takes members of the media on a tour of Cobo Center during the final hours of construction at the 2013 North American International Auto Show on January 10, 2013. (credit: George Fox/CBS 62)