I have no further interest in the Benghazi story, so I ask this question, in large part, out of ignorance.

I keep hearing talk about some apparent "cover up" with this situation. If we were attacked by people outside of the U.S., what exactly are we "covering up?" It always seems to me that when one covers up he/she is trying to cover up a crime or malfeasance, but, I don't think that we have committed any crimes there, right?

So, what is the "cover up?"