Energy Secretary Ernest Moniz sits with Secretary of State John Kerry and Undersecretary for Political Affairs Wendy Sherman during a meeting with Iranian Foreign Minister Javad Zarif in Vienna, Austria. Moniz, the eccentric MIT professor-turned-U.S. Energy secretary, by all accounts played a pivotal role in reaching the historic nuclear accord. Now with his diplomatic legacy on the line, President Barack Obama is turning to Moniz to help sell the deal to a highly skeptical Congress. (Carlos Barria/Pool via AP, File/June 30, 2015 file-pool photo)
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