In August 2008, back when it mattered, the Washington Post ran a 10,000-word article by its Pulitzer Prize-winning reporter David Maraniss titled, “Though Obama Had to Leave to Find Himself, It Is Hawaii That Made His Rise Possible.” For reasons that will soon become clear, Maraniss should have excused himself from this assignment once he discovered the identity of the man in Hawaii who made that rise possible. Barack Obama referred to this man in his 1995 memoir, Dreams from My Father, as “Frank.” If there was any mystery to Frank’s identity, Gerald Horne, a leftist scholar from the University...