On Thursday, the committee, known as AIPAC, was handed a stinging defeat. After Mr. Obama mustered enough Democratic backing in the Senate to halt a vote on a resolution of disapproval against the deal, a group known for its political clout saw its power and reputation in Washington diminished.
“They failed — they couldn’t even get a vote,” said Clifford Kupchan, an Iran expert and the chairman of the Eurasia Group, a consulting firm, who noted that AIPAC had gone “all in” and tried everything to stop the deal. “It’s among the biggest setbacks for AIPAC in recent memory.”
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