By the foremost expert on the NSA in the world: Russia and the email scandal

"The problem with attempting to draw a straight line from the Kremlin to the Clinton campaign is the number of variables that get in the way. For one, there is little doubt about Russian cyber fingerprints in various U.S. campaign activities. Moscow, like Washington, has long spied on such matters. The United States, for example, inserted malware in the recent Mexican election campaign. The question isn’t whether Russia spied on the U.S. presidential election, it’s whether it released the election emails.  Then there’s the role of Guccifer 2.0, the person or persons supplying WikiLeaks and other organizations with many of the pilfered emails. Is this a Russian agent? A free agent? A cybercriminal? A combination, or some other entity? No one knows.  There is also the problem of groupthink that led to the war in Iraq. For example, just as the National Security Agency, the Central Intelligence Agency and the rest of the intelligence establishment are convinced Putin is behind the attacks, they also believed it was a slam-dunk that Saddam Hussein had a trove of weapons of mass destruction.   Consider as well the speed of the political-hacking investigation, followed by a lack of skepticism, culminating in a rush to judgment. After the Democratic committee discovered the potential hack last spring, it called in the cybersecurity firm CrowdStrike in May to analyze the problem."