Earlier I linked to this Chris Bowers post which after further investigation is a bit unfair to Rahm Emanuel. While it is true that Iraq was not front and center in many of his answers to Tim's questions which allowed opportunities to differentiate Republicans and Democrats, it isn't the case that Emanuel was entirely silent on the subject for all such questions.
It's certainly the case that they still seem to be unable to settle on a simple message with respect to Iraq, but that's not the same thing as ducking the issue entirely.