Thank you for a simple but well-stated explanation for the lack of DNC support for this candidate. I admit to being puzzled by the strategy (or lack thereof) on the part of the Democratic establishment, but I'm not willing to resort to some of the crass, juvenile oversimplifications you see coming from some Berniecrats (God bless populism!).
That said, I do think the Dem establishment is trying to have it both ways. Cozying up to Wall Street then presuming to downplay the fact so as not to alienate Main Street only highlights an elevation of power and influence over principle. It appears duplicitous and appearances are everything in politics. Republicans are in power today because power and influence has become the principle of their party - it's a "big boy" game that Dems will always lose. There is no such duplicity with Republicans. (Their duplicity manifests in different ways I won't go into here.)
The Dem establishment had better wake up and take a (final?) stand on principle. If they can't even support worthy candidates in the field for fear of ruining their chances, then they need to either dramatically change strategy or disband. In other words, lead, follow, or get out of the way. These are pivotal and dangerous times. None of us can afford the luxury of dithering. It would be so much better if the party would embrace a vision for the future. So far, this is something that neither major party has been willing to try.