Bismarck

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Political commentator Sean Hannity addresses the crowd while delivering his speech, "Get America Back to Work", Thursday, May 22, 2014, during the 22nd Williston Basin Petroleum Conference oil expo in Bismarck, N.D. (AP Photo/Kevin Cederstrom)

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Political commentator Sean Hannity addresses the crowd during his speech, "Get America Back to Work," Thursday, May 22, 2014, during the 22nd Williston Basin Petroleum Conference oil expo in Bismarck, N.D. (AP Photo/Kevin Cederstrom)

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Political commentator Sean Hannity addresses the crowd while delivering his speech, "Get America Back to Work", Thursday, May 22, 2014, during the 22nd Williston Basin Petroleum Conference held in Bismarck, N.D. (AP Photo/Kevin Cederstrom)

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Billionaire oilman Harold Hamm, chairman of Oklahoma City-based Continental Resources Inc., delivers his speech, "Rock Steady in the Bakken", Thursday, May 22, 2014 during the 22nd Williston Basin Petroleum Conference held in Bismarck, N.D. (AP PhotoKevin Cederstrom)

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Billionaire oilman Harold Hamm, chairman of Oklahoma City-based Continental Resources Inc., delivers his speech, "Rock Steady in the Bakken", Thursday, May 22, 2014, during the 22nd Williston Basin Petroleum Conference in Bismarck, N.D. (AP Photo/Kevin Cederstrom)