So far I've seen ZERO EVIDENCE. Reuters and the Washington Post have breathless claims of Russian hackers "according to officials familiar with the matter." Uh huh. Saying "APT29" or "CozyBear" doesn't make the accusation any more credible. If multiple US agencies are trumpeting the same story, you really must ask yourself "Why? Why this? Why now?" It's pretty amusing, in a depressing way, to see how quickly so many…
It's always some big conspiracy theory that multiple cyber security agencies, all the three letter agencies, and multiple news agencies are in on.
I'd bring up tin foil hats, but nowadays we can make fabric faraday cages so we can all be fashionable no matter what we believe.