Why was there not an aircraft carrier task force in the Mediterranean during that time?? Any other President would have had a carrier handy because it represents incredible force multiplication and provides the President with many options. A carrier in WestMed could have had fighters over Benghazi in minutes, and kept them there with tankers and relief fighters indefinitely. You can fly any kind of Marine assault aircraft off of a carrier, refuel it and provide support for an assault/rescue force almost immediately. And you are not dependent on using airfields or overflying anyone's airspace.
The bottom line is that our forces were not in position to support or rescue the Benghazi mission because of deliberate choices made by the National Command Authority, Obama and Leon Panetta. Our forces stood down shortly after Obama was immaculated, and that's why nobody was around to help.