Goldstone/J-Street/Soros connection?

OK, I'm not a big fan of conspiracy theories, but this is really interesting.

There is a House Resolution 867 that should be voted on tomorrow:

Calling on the President and the Secretary of State to oppose unequivocally any endorsement or further consideration of the "Report of the United Nations Fact Finding Mission on the Gaza Conflict" in multilateral fora.

According to Michael Goldfarb at the Weekly Standard, Goldstone responded to the resolution with a memo detailing what he considered to be mistakes in the facts. Goldfarb gives a link to a Word document that he says is circulating around Capitol Hill that starts off this way:

FROM: RICHARD GOLDSTONE
TO: INTERESTED PERSONS
RE: HR 867

Here are some comments on this resolution in an effort to correct factual errors:

Here's where it gets interesting.

The Microsoft Word document properties do not show Richard Goldstone as the author, but rather "Morton H. Halperin." As Goldfarb notes, Morton Halperin "serves on the J Street advisory council and is a senior adviser at George Soros's Open Society Institute.

Is Goldstone working with J Street and Soros in defending his report? More importantly, is J Street really discreetly backing the report while it says publicly that it is not opposing the congressional resolution?

Right now, the only source for this Word document is Goldfarb's column. I found a different letter written from Goldstone to the sponsors of the resolution, dated two days later, that also addresses perceived mistakes in the text, but not as a Word document. I presume that Goldfarb received his memo from a congressional aide, but we don't know his source.

Either way, it is worth finding out whether there is any connection between Goldstone and Halperin.

(h/t EBoZ)