Israeli Prime Minister Benjamin Netanyahu and his wife Sara Netanyahu talk to the press after attending an exhibit on Jerusalem's Jewish history at the United Nations on Thursday. Timothy A. Clary/AFP/Getty Images hide caption

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Timothy A. Clary/AFP/Getty Images

Rep. Ed Perlmutter shakes hands with Carlyn Meyer and other members of the groups J-Street and as they urge him to support the Iran nuclear deal at an event in Denver. J-Street plans to spend about $5 million on ads in this fight, which is vastly dwarfed by the $20 million to $40 million from groups like AIPAC that oppose the agreement. Jason Bahr/Getty Images hide caption

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Jason Bahr/Getty Images

Lobbyists Spending Millions To Sway The Undecided On Iran Deal

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Vice President Joe Biden, projected on screens, gestures as he addresses the American-Israeli Public Affairs Committee (AIPAC) 2013 Policy Conference in March. Susan Walsh/AP hide caption

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Susan Walsh/AP