IF the FBI were doing its job, Obama would not be in the white house. IF they are investigating him, it's too little too late.
I've read both of his books, studied his background and reviewed his purported "birth certificate." This man is a fraud at many levels with a biography that has been created for him based on lies, forged documents and manipulated photographs. One of the photos of the youthful Obama is so clumsily fabricated that you can see where they pasted his head (or some teen aged black person's head) on a white person's body. The head is a black person, but the arm, revealed by a rolled up shirt sleeve, is that of a white person! (Oooops!)
His books are jokes and contain contradictions, errors and many outright lies. Among the mistakes and inconsistencies in his books are incorrect dates for his parents' wedding, his wedding, his employment history, his educational history, his family history, as well as manufactured phony quotes from Abe Lincoln and others. The only truthful representations about him is that he does appear to have spent much of his youth under the influence of mind altering chemicals.
No doubt his years in Chicago are riddled with criminal associations. Historians will have a great time with his past...twenty or so years from now. Too late to help us.