I heard someone make the claim that a certificate of LIVE BIRTH (as opposed to a STILLBORN BIRTH) is not the same as a birth certificate that would determine citizenship (I don't know the legal limits of either, but this sounds reasonable).
Obama refused to let Hawaii show their records (for what reason?) at enormous expense and for so long AND without valid explanation of why anything official was being hidden from public view.
Obama wants to be re-elected next year and that is why he is addressing this issue (plus Donald Trump is now pressing the issue so that he might be elected over Obama).