Most likely, the DNC e-mails were nabbed by multiple parties. The effort required would have been low, given passwords like “password”.
The Russkis may well have hacked the e-mails, but would have found them more valuable if not released, as Hillarity was widely projected to win easily. (The Russians would want the people they could blackmail to win.)
WikiLeaks, OTOH, appears to have had someone “inside” who merely copied the files onto a flash drive. And then WikiLeaks released them. (Assange doesn’t much like Trump, but, he HATES Hillarity.)
The rumor is that every decent hacker on the planet has the Podesta emails. Some may not even know they do since using “password” to gain access to accounts is a training exercise for beginning hackers.
Sounds right to me. The Russians would never give up dirt on a politician if they think they can use it as blackmail. Thus is their MO. The dimwits, ya know, the military haters, if they weren’t so smug and arrogant may have avoided this by understanding operational security! We are all better off they don’t know what that is!