Attacks on embassies or as in this case consolates are a serious matter! A VERY SERIOUS MATTER!
This is the sort of thing that is supposed to go automatically to the White House! There's actually a code for such messages so HE HAD TO HAVE KNOWN!
And what you are suggesting is that Obama is the sort of micromanager that probably won't allow the guards to be changed at the Pentegon without his approval? IS THAT WHAT YOU REALLY WANT?
And a 7 hour delay? Really? You don't think somebody at the State Department wouldn't have told the President prior to that?
By the way what Obama was doing was prepping for his Fundraising tip to Vegas later that day. He actually got there before somebody obviously told him it was making him look bad!