I have no idea if it came from Russia or what, but I have noticed that politicos have chosen to take this point and run with it rather than discuss the actual contents of the leaked documents.
This is a case where the source of the information does matter - the article notes that a number of files were edited and that tampering with information isn't new for Russian intelligence. That's not to say the leaks are false, it's just that skepticism is a prudent response.
I've also seen articles that focus on criticizing Wikileaks for publishing the emails containing personal information (addresses, SSNs) of donors. The real story is that the DNC was sending this information around in unencrypted emails.