Who sabotaged the AIPAC investigation?

The leak to CBS news which disclosed the investigation
of Lawrence Franklin and his relation to AIPAC and Israel
has had the effect of ruining the chances
of fully understanding this matter.

See, for example, this excerpt (emphasis added):

The premature disclosure has caused problems for investigators,
according to numerous law enforcement officials
speaking on the condition of anonymity
because the probe is ongoing.

"This has severely hampered their investigation,"
one law enforcement official said.
"It's impossible to tell what might have been lost
because of all this."

and this:

[I]nvestigators have already been forced to move
more quickly than they had hoped
because news organizations became aware of the inquiry.

Some officials suspect that the case will never reach the level of an espionage matter.
Investigators do not fully understand the motivations
of two Aipac officials who they believe
were in contact with Mr. Franklin.
Moreover, investigators have given up their hope
of determining whether Israel regarded Mr. Franklin
as an asset in a formal intelligence collection operation
or as informal source.

The U.S. has lost the ability to fully investigate
this serious compromise of classified documents,
specifically because some person in the government
leaked knowledge of the investigation.
In other words, they deliberately tipped off
those who were under investigation.
This is exactly what would happen if
the leaker was also a mole,
and wished to tip off his fellow moles
without using communication channels
which his knowledge of the investigation told him
had been compromised.

Why is not the government investigating this leak,
and why is not the media demanding that just that happen,
as they did in the case of Valerie Plame?

I suggest that the answer is that Jews,
throughout both the government and the media,
are working together to ensure that Israeli spying
is not thoroughly investigated.