According to Bill Binney only two looked into and one, the NSA, did some peripheral forensic's on it and came back with a low expectation analysis Russia hacked into the DNC servers. When further forensics was done on the same data with his group, they were able to determine the DNC was hacked locally and not from an oversea's source like Russia.
So it was locally done on our soil. Who on our soil did it, he could not say. The fact that our law enforcement issued indictments for 12 Russians based on inferior forensics should be the question in all the minds who want to get to the truth and not brush it under the rug with this dog and pony show RR is offering up to the public.