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Hunter Biden co-founded a lobbying firm, Oldaker, Biden & Belair LLP, along with William Oldaker, a supporter of Mr. Biden who helped launch his political action committee, Unite Our States, in 2005.

The firm’s clients over the years included the University of Delaware, for which Mr. Biden has secured millions of dollars in earmarks, and the University of Scranton in Mr. Biden’s Pennsylvania hometown.

Obama campaign officials say Hunter Biden has never lobbied his father, nor sought any special favors from his father on behalf of clients.