Now more revelations have started to leak. I did a bit of further research (hat tip: Cheryl Lewin) about another donor and supporter of J Street: Gail Furman. She sits on its advisory council and is a donor listed on its Form 990. She is also a member of the board of the Soros-created Democracy Alliance -- a group of wealthy donors and liberal activists created with the goal of tipping elections (so is another J Street donor and member of the advisory council, Deborah Sanger).
thanks for the ping