Seems like the administration was running arms/missiles to Syria via Turkey from Benghazi, which US Ambassador. Stevens brokered. To tie up loose ends, they arranged to have Stevens sent to Benghazi with little security or protection on 9/11 when attacks were likely and left him to die.
Unfortunately for them, this has been picked up and is getting attention. Cue these other scandals (IRS/AP) which they calculated would distract attention from Benghazi. Unfortunately again, for them, instead of distracting from Benghazi, it has morphed in public perception into a "Trifecta of Corruption" in which these individual scandals are reinforcing the others and attracting magnitudes more attention to all the scandals.
People on both sides of the political spectrum are starting to agree, and that spells big trouble for them, and I include the "mainstream"/"old guard" core Republicans. Division is what keeps *both* parties in power...while taking ever more power and freedom from us.