Feller: Obama's Missing Explanation

The Obama position is that the administration honestly shared intelligence on the terror attack in Benghazi as information changed. If the president's exlpanation is true, then Ben Feller from AP wants to know why the intelligence was so bad.

What happened with the intelligence to allow this to happen? There's no question that the explanation from the White House... has changed... but it ignores the point about why was the intelligence wrong in the first place? How did they get this so wrong?