** FILE ** President Obama gets a round of golf in with hospital executive Eric Whitaker during the president's vacation on Martha's Vineyard in Oak Bluffs, Mass., in August. Mr. Whitaker, whom he met years ago at Harvard, is one of the president's best friends. (Associated Press)

** FILE ** President Obama gets a round of golf in with hospital executive Eric Whitaker during the president's vacation on Martha's Vineyard in Oak Bluffs, Mass., in August. Mr. Whitaker, whom he met years ago at Harvard, is one of the president's best friends. (Associated Press)