I take it that the unstated reason Hillary Clinton, for example, says this (and she's actually pretty honest about this) is to maintain oil security. But my point is we don't need Iraq for oil security.
However, I can see the story Jerome quotes as being the sort of thing driving the "stay in Iraq" talk.
The problem is not the Bush administration, it is systemic and Bush/Cheney are just a symptom. Can the last politician to go out the revolving door please turn the lights off?