Here is what the governor had to say on Fox News Sunday:
WALLACE: All right. Let's do a lightning round on specific issues -- quick questions, brief answers. You say that there are places that you differ with President Bush on Iraq. Such as? ROMNEY: Well, I don't think we did an adequate job explaining to the American people all the reasons for entering Iraq. There were obviously intelligence failures. I think the prison abuse scandal is something which has been unfortunate. I think also that we haven't had sufficient troops following the period of major conflict, and so those are not new or novel observations. I think the president would agree there's a benefit that comes with hindsight. And yet I supported the president at the time that he entered into Iraq and believed that he had the kind of information he needed to have to make that decision.
Also worth a read is this review of Ambassador Paul Bremer's book, My Year in Iraq, by New York Times reporter Dexter Filkins.