I think Bush has it correct. If you listen to outgoing Iranian UN ambassador, Dr. M. Javad Zarif, he claims security in Iraq is within the best interest of Iran. So why not supply weapons to at least the south of Iraq which is where Shias have influence? Iran feels it's time to gain position in the region whilst civil war goes on as there have been major wars in the area for a good part of late last century and now, all of which affected Iran.
The issue, however, is it's not our civil war. Nonetheless, if we have to be involved, Iran is willing to talk to the U.S., again according to Zarif.
The problem with monkies, though, is they can't talk. Gorillas, at best, might understand sign language.