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Justin Giles of Wasilla, Alaska stands guard on a bridge over the Virgin River during a rally in support of Cliven Bundy near Bunkerville, Nev. Friday, April 18, 2014. (AP Photo/Las Vegas Review-Journal, John Locher)

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In this April 16, 2014 photo, a tassel of corn grows in a field on Pioneer Hi-Bred International land in Waialua, Hawaii. The nation’s leading corn seed companies have farms in Hawaii, but their fields have become a flash point in a spreading debate over genetic engineering in agriculture. (AP Photo/Audrey McAvoy)

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In this April 16, 2014 photo, a tassel of corn grows in a field on Pioneer Hi-Bred International land in Waialua, Hawaii. The nation’s leading corn seed companies have farms in Hawaii, but their fields have become a flash point in a spreading debate over genetic engineering in agriculture. (AP Photo/Audrey McAvoy)

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FILE - This March 25, 2014 file photo shows a machine mixing sand and water, left, before it is pumped underground during a hydraulic fracturing operation at an Encana Corp. well pad near Mead, Colo. The energy boom is scrambling national politics. Democrats are split between environmentalists and business and labor groups. Some deeply-conservative areas are allying with conservationists against fracking, the technique largely responsible for the surge. (AP Photo/Brennan Linsley, File)

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** FILE ** This March 25, 2014, file photo shows heat from machinery distorts the air as a worker watches over a hydraulic fracturing operation at an Encana Corp. gas well near Mead, Colo. (AP Photo/Brennan Linsley, File)

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FILE - This March 25, 2014 file photo shows a worker adjusting hoses during a hydraulic fracturing operation at an Encana Corp. gas well, near Mead, Colo. The energy boom is scrambling national politics. Democrats are split between environmentalists and business and labor groups. Some deeply-conservative areas are allying with conservationists against fracking, the technique largely responsible for the surge. (AP Photo/Brennan Linsley, File)

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FILE -This Dec. 5, 2012, file photo shows Sen. Mary Landrieu, D-La. on Capitol Hill in Washington. An indefinite extension to the government’s review of the contentious Keystone oil pipeline, announced late Friday, April 18, 2014, by the State Department, is doing little to quell the political posturing over the project, which has taken on a life of its own as climate change activists duke it out with energy advocates from both parties. For Landrieu, whose competitive race in Louisiana will help determine whether Democrats retain control of the Senate, the delay comes at a particularly sensitive moment. Landrieu recently took the helm of the Senate Energy Committee, and has been touting her new position to argue that she offers voters in oil-dependent Louisiana the best chance to influence America’s energy policies _ including approval of Keystone XL. (AP Photo/Manuel Balce Ceneta, File)

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Dawa Yangzum, right, a relative of Nepalese Sherpa Dawa Tashi, who was injured during an avalanche, waits at a hospital in Katmandu, Nepal, Friday, April 18, 2014. An avalanche swept down a climbing route on Mount Everest early Friday, killing at least 12 Nepalese guides and leaving three missing in the deadliest disaster on the world's highest peak. (AP Photo/Niranjan Shrestha)

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Hospital staff get ready to receive the injured from an avalanche on the helipad of Grandy hospital, in Katmandu, Nepal, Friday, April 18, 2014An avalanche swept down a climbing route on Mount Everest early Friday, killing at least 12 Nepalese guides and leaving three missing in the deadliest disaster on the world's highest peak. (AP Photo/Niranjan Shrestha)

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fLos Angeles Dodgers starting pitcher Zack Greinke throws to an Arizona Diamondbacks batter during first inning of a baseball in Los Angeles, Friday, April 18, 2014. (AP Photo/Chris Carlson)

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Houston Astros' Paul Clemens pitches to an Oakland Athletics batter in the second inning of a baseball game Friday, April 18, 2014, in Oakland, Calif. (AP Photo/Ben Margot)

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Deputy Revenue Commissioner Mike Pawlowski, left, addresses members of the House Finance Committee as the committee prepares to advance the governor's gas line bill on Friday, April 18, 2014, in Juneau, Alaska. Also shown is Revenue Commissioner Angela Rodell and Natural Resources Commissioner Joe Balash. (AP Photo/Becky Bohrer)