by Michael R. Gordon
WASHINGTON — When the bipartisan advocacy group United Against Nuclear Iran decided last week to mobilize opposition against the nuclear deal with Tehran, Gary Samore knew he could no longer serve as its president.
The reason: After long study, Mr. Samore, a former nuclear adviser to President Obama, had concluded that the accord was in the United States’ interest.
“I think President Obama’s strategy succeeded,” said Mr. Samore, who left his post on Monday. “He has created economic leverage and traded it away for Iranian nuclear concessions.”
As soon as Mr. Samore left, the group announced a new standard-bearer with a decidedly different message: Joseph I. Lieberman, the former senator from Connecticut and the new chairman of the group.