Great question to ask. IMHO, I would get all three quotes into a single campaign ad and then ask Obama to explain it. That negates the criminal action you indicated as a possible outcome and snuffs the idea that Republican have taken no action, by allowing time for Obama to explain his stance on the discrepancy.
The back and forth will cause doubt, put Obama in the defensive, cast doubt onto his foreign/domestic(?) ideals and help ...eerrr....undecideds...... see that this is a socialist in an Armani suit.
What do you propose be done, if any?
Your idea is probably as good as anything I could come up with, but I really don't think it would have much effect. To Obama voters, the discussions with the Iraqi government would be seen as "foreign policy experience", a factor in his favor. I don't think there's any way the true nature of Barack's business there could penetrate Liberal Mind Fog.