Of course the DNC is committing fraud. The emails by DNC’s crooked ex-head Debbie Wasserman-Schultz, revealed by WikiLeaks, proved that the DNC illegally conspired to promote Hillary and to hide the support that Bernie Sanders was getting, including vote fraud in which Sanders got more votes but Hillary somehow “won” the nomination. Not only do their rules let them pick who they want, but the emails prove they are willing to cheat as well in order to determine the nominee regardless of actual votes.
What is even more worrisome is the fact that these same liars and cheats are willing to do the same things to “win” the Presidential election as well. I suspect Trump may be correct that only vote fraud gained Hillary the popular vote.