What does “a real black President” mean?

When media mogul Rupert Murdoch tweeted about his fondness for Dr. Ben Carson and his wife Candy Wednesday night, musing “What about a real black President who can properly address the racial divide?” he reignited a remarkably complicated, difficult question that might speak volumes about progress Americans have or haven’t made in the past eight years – and possibly the next four.

Since Barack Obama’s first days as a senator, debates swirled about whet