A lefty perspective on Democratic politics

A little perspective from the left: I'm reading about the shakeup at the DNC. I have to say that the rather heavy handed "purge" of Sanders and Ellison supporters executed by Perez bodes ill for Democratic unity right when we cannot afford internecine fighting. My guess is that a certain class of donors is demanding a centrist "party line." I am very concerned that the establishment of the Democratic party has failed to recognize that there has been a major leftward shift in the party's rank and file since 2008, and if they attempt to rule the party top down, it could cost Democrats dearly in 2018 and 2020, when we simply cannot lose. 

I hope I'm wrong and that more inclusive attitudes prevail, including a recognition that policy positions need to track the views of the majority of Democrats more closely going forward. But I, like many Sanders supporters, intend to commit my time and money to the progressive organizations within the party umbrella like the Progressive Change Campaign Committee, rather than the DNC, DCCC and DSCC, precisely to help ensure that happens.