Expert: U.S. underestimated the threat

 	An armed man waves his rifle as buildings and cars are engulfed in flames after being set on fire inside the US consulate compound in Benghazi late on September 11, 2012. An armed mob protesting over a film they said offended Islam, attacked the US consulate in Benghazi and set fire to the building, killing one American, witnesses and officials said. AFP PHOTO (Photo credit should read STR/AFP/GettyImages) 

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    Expert: U.S. underestimated the threat

Erin Burnett talks to Geoff Porter about why there wasn't enough man power in Benghazi prior to the Sept. 11th attack.