If what you are saying is that the democratic party could change because we vote in enough progressives then I have a bridge to sell you. The capitalists who own the government would just out-finance progressive election attempts. Think of how many progressives we would need to have it impact the whole Dem party, now think about how many elections that is where the entire force of the media is against the politician who will actually fight for you. Now consider how easily manipulated our wildly uneducated population is.

I know its a bitter pill to swallow but capitalism has already destroyed democracy long ago. It is just that we have been in decline for so long now that it is finally becoming unavoidably obvious.