Today's news of allegedly provable Iranian interference in Iraq in the form of palpable assistance to SUNNI insurgents is a chilling reminder of the hornets' nest our invasion of Iraq has bestirred. Clearly, support for the Sunni's, ever more clearly than for the Shiites alone, would seem to signal a commitment by Iran to roil the Iraqi waters sufficiently so as to perpetuate the civil war, and maybe even bring it to culmination with a failed state openly under the sway of its Persian neighbor.
This presents a major complication regarding our military mission in Iraq. If withdrawal was palatable in a situation of "free-wheeling civil war" in Iraq, with hopes that an acceptable resolution was possible if only after a very bloody interlude, then the "resolution" that seems to face us now is a grandly expanded Iranian influence, nuclear weapons "in hand."
Now, I won't rush to judgment on the future of our military commitment, but I think it is the hallmark of prudence to send a general alert for purposes of prevention or, failing that, preparation.