His statement gives him plausible deniability. He can be shocked Shocked SHOCKED to learn what was going on at the State Department. AFAIK, the Obamas and Clintons still hate each other. But Obama obviously can't be seen as anything but supportive of the Democrat front runner in public. (This theory is consistent with Bubba's recent spontaneous statements about the last 8 years when he's off the reservation/off his meds.)
The big question is who has more on whom? We know hillary has the original BC of zero from Kenya and no telling what elese zero/val jar undoubetedly have. Its tit for tat commie vs. commie.
Hillary has some stuff on Obama, if leaked, could probably start a fire. Obama knows if Hillary goes down, she may sing a song about him. He can’t let that happen now. Obama is better off letting Hillary run free, and gambling she will beat the person the GOP elects. If Trump or Cruz win as President, Obama and Hillary may be exposed.