Rep. Ed Perlmutter shakes hands with Carlyn Meyer and other members of the groups J-Street and MoveOn.org 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