And on and on perhaps. Obama can't land the definitive blow, but Clinton is finished by all accounts. Yet, as expected, we will be subjected to several more weeks of two people who basically agree with one another doing John McCain's work for him by beating each other's brains in.
Obama needs to really concentrate at this point on staying positive. If he essentially can't lose, there is no reason to sully the reputation by needlessly getting down in the mud.