You assume one of two things:
1) That Assange is telling the truth. He dodged the question and said it didnt come from the Russian STATE.
“. . . over the last two months, that our source is not the Russian government and it is not a state party.”
2) That Russia is dumb enough to leave fingerprints on it. You thought their State Dept would contact Assange directly?
EVERY intelligence office in the US is saying Russia hacked the DNC.
And here is ICING ON THE MOTHER****ING CAKE:
http://time.com/4625301/cia-russia-wikileaks-dnc-hacking/