It seems pretty clear now that it was a leak from inside, and the whole Russia narrative is false. In fact, it looks like the Russians were framed, perhaps by Guccifer. And perhaps by our own intelligence community:
By any balanced reckoning, the official case purporting to assign a systematic hacking effort to Russia, the events of mid-June and July 5 last year being the foundation of this case, is shabby to the point taxpayers should ask for their money back. The Intelligence Community Assessment, the supposedly definitive report featuring the “high confidence” dodge, was greeted as farcically flimsy when issued January 6. Ray McGovern calls it a disgrace to the intelligence profession. It is spotlessly free of evidence, front to back, pertaining to any events in which Russia is implicated. James Clapper, the former director of national intelligence, admitted in May that “hand-picked” analysts from three agencies (not the 17 previously reported) drafted the ICA. There is a way to understand “hand-picked” that is less obvious than meets the eye: The report was sequestered from rigorous agency-wide reviews. This is the way these people have spoken to us for the past year.
What’s surprising is the publisher of this story, hardly a publication you’d think would be sympathetic to the narrative: The Nation.