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In August, the nonpartisan Center for Responsive Politics said that Mr. Solomont was just one of a growing number of Democratic fundraisers and political donors picked by Mr. Obama for ambassadorships, a practice that career diplomats in the State Department have long criticized.

Mr. Solomont helped solicit - or “bundled” - at least $500,000 for Mr. Obama’s White House run, while he and his family have given about $1.8 million to politicians and political causes since 1989, almost entirely to Democrats.

The contributions include about $770,000 to the Democratic National Committee. Overall, Mr. Solomont is the biggest political donor among Mr. Obama’s ambassadorial picks, according to the center.