A reader forwarded a link to this Babbin piece in NRO, which I think is good Op/Ed fodder. A snippet:

There is more, much more, than is being reported about the suicide bombing that killed four Americans earlier today. And from a very credible source, I have heard enough to convince me I had to correct something I wrote this morning. This suicide attack does represent an evolution of this war to something far uglier than we may be prepared to deal with. The suicider was not, as the Iraqi vice president announced, an Iraqi army officer. He was a member of Hamas--or possibly a Saudi--and one of many terrorists that are embedded throughout Iraq. This is no longer a war to remove the threat of Saddam's weapons of mass destruction and liberate Iraq. Yes, those still are part of our objectives. But it is--much more--a war between our conventional forces and most of the terrorist world.