Folks can get caught up at The Other McCain, "If You Were Saying to Yourself, ‘This Petraeus Scandal Isn’t Crazy Enough …’"
But see especially Katie Pavlich for some phenomenal reporting at Townhall, "Sex Scandal Reveals Why There is a Benghazi Coverup":
Since the 9/11 attack on the U.S consulate in Benghazi, we've been told an anti-Islam YouTube video was to blame. We know the consulate was attacked multiple times throughout 2012 and U.S Ambassador Chris Stevens had received multiple threats from al Qaeda before being killed on 9/11 with three other Americans. From the beginning the story never added up and the YouTube video excuse has been proven a complete lie, but the recent revelations of an affair between General David Petraeus and biographer Paula Broadwell may have given us the missing link to this whole thing. It isn't the affair itself that gives us more information, but the affair bringing attention to words spoken by Broadwell in Denver on October 26. She said the CIA was holding prisoners at the annex in Benghazi and Fox News has confirmed with another source this was the case.Here's the report referenced there, at Fox News: "EXCLUSIVE: Petraeus mistress may have revealed classified information at Denver speech on real reason for Libya attack."
This explains two things. The U.S. consulate in Benghazi was being repeatedly attacked because prisoners were being held and because President Obama signed an executive order in 2009 banning secret CIA prisons, they had to find an alternative story to cover-up what really happened, hence the YouTube video.
Plus, here's Jennifer Griffin's interview on this from earlier today, at the link.