OK, Iran is working with the Zetas... and Holder is running guns to the Zetas. What the heck?
Suggest you read Tom Clancy's Clear and Present Danger. While it's not 1:1 corespondence, the similarities are... intriguing.
Not really ... Holder was sending guns to the Sinaloa cartel, the #2 enemy of the Zetas.
Actually, this makes the whole story even more weird.