Media mogul billionaire Rupert Murdoch waded into controversy Thursday over a tweet about the president of the United States, questioning whether Barack Obama is a 'real black president.' 'Ben and Candy Carson terrific,' Murdoch wrote. 'What about a real black President who can properly address the racial divide? And much else.' Murdoch's tweet was in support of Dr. Ben Carson, Republican presidential candidate and the only African-American in the race.