Photograph : President Obama Tours Sempra Solar Plant - Las Vegas Sun News

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President Barack Obama speaks during a visit to Sempra U.S. Gas & Power's Copper Mountain Solar 1 photovoltaic plant Wednesday, March 21, 2012 south of Boulder City.

Sam Morris / Las Vegas Sun

President Barack Obama speaks during a visit to Sempra U.S. Gas & Power's Copper Mountain Solar 1 photovoltaic plant Wednesday, March 21, 2012 south of Boulder City.

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