Obama campaign manager David Plouffe just sent reporters a memo outlining strategy for the states that will vote on February 5, and the two references he makes to Hillary Clinton are pluralised (emphasis mine):
California and New Jersey, two states the Clinton s have pointed to as firewalls, both will have healthy independent turnout in the Democratic primary. We expect to see a great deal of movement to Obama from superdelegates in the coming days, seriously eroding the Clinton s' existing advantage in this universe.
The subtle message to Obama supporters seems to be that the former president is pulling the political strings of his wife's operation.