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FILE - In this Feb. 3, 2012, file photo Republican presidential candidate, former Massachusetts Gov. Mitt Romney, greets campaign volunteers at a phone banking center in Las Vegas, Nev. Romney's campaign notes that the contest this time looks very different from 2008, despite the Democrats' persistent registration edge in the state. With Nevada boasting the highest unemployment rate in the nation, polls show the Republican candidate remains within striking distance. (AP Photo/Gerald Herbert, File)

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FILE - In this Feb. 3, 2012, file photo Republican presidential candidate, former Massachusetts Gov. Mitt Romney, greets campaign volunteers at a phone banking center in Las Vegas, Nev. Romney's campaign notes that the contest this time looks very different from 2008, despite the Democrats' persistent registration edge in the state. With Nevada boasting the highest unemployment rate in the nation, polls show the Republican candidate remains within striking distance. (AP Photo/Gerald Herbert, File)
FILE - In this Feb. 3, 2012, file photo Republican presidential candidate, former Massachusetts Gov. Mitt Romney, greets campaign volunteers at a phone banking center in Las Vegas, Nev. Romney's campaign notes that the contest this time looks very different from 2008, despite the Democrats' persistent registration edge in the state. With Nevada boasting the highest unemployment rate in the nation, polls show the Republican candidate remains within striking distance. (AP Photo/Gerald Herbert, File)
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