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Lugar faces toughest test among Indiana Republicans

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May 3, 2012 9:47 PM EDT Indiana Treasurer Richard Mourdock, a Republican candidate for the U.S. Senate, and Sen. Richard G. Lugar talk with Bloomberg's Mark Niquette about Tuesday’s primary race. Polls have shown Mourdock ahead of 80-year-old Lugar who has held a seat in the Senate for more than 35 years. (Bloomberg)

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