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Associated Press
FILE - In this Thursday, March 22, 2012 file photo, tourists stop to watch the canopy light show at the Fremont Street Experience in Las Vegas. Despite some recent diversification, Nevada's economy is more concentrated than virtually any other state. The tourism/gambling sector accounts for more than one-quarter of Nevada's 1.14 million non-farm jobs, and 13 of the 20 largest employers are casino/hotel companies. President Barack Obama and his Republican rival, Mitt Romney, have visited the state, competing strenuously for Nevada's six electoral votes in what has become one of the most intense swing-state contests. (AP Photo/Julie Jacobson, File)

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