It is very interesting that this demand only happened after Hillary lost.  The release of emails from the DNC and Podesta have been going on for over a year.  Why only after they lost. It is embarrassing to the Dems that leaks showed the DNC rigged the election against Sanders.  Are the Dems saying the collusion between the press and Hillary's campaign was alright?  That the purchase of rioters at Trump campaign was alright.  I don't support the hacking, but the result was a better informed populace.  This seems something the Dems are totally against. So in true liberal politics, disregard the message and kill the messenger. No one denied the email content.  Obama said the Russians have been hacking since the 2008 election.  Then why did the investigation take 8 years?  Answer because the Dems were happy with the results until now.   I think you will find this is a leak within the DNC by a Sander's  supporter because of the way Sanders was treated.