Did Obama Attack the American Embassy in Libya?

I just saw headlines on Yahoo that the "Republicans assail Obama on the Libya 9/11 attack."

I don't understand.  Do they think Obama was one of the terrorists that attacked the Embssy?  Do they have proof? 

Did they ask the President what he was doing on 9/11?  If he said he was giving a speech to  thousands of people in a stadium they should demand that he prove it.  And don't accept photos or videos.  Remember he probably has photoshop. - Remember how he fooled everybody with that birth certificate.