@ehBeth,
Than why do Hillary supporters add them to their delegate count when they claim Bernie can't win? If they aren't effective, the DNC still uses them and they certainly aren't meant to be reflective to the popular vote.
If they're used to over ride, say Independents or GOP operatives from registering as a Dem to rig the general election - that would certainly speak to how screwed up the primary system is.
The very first thing that needs to be done is change to a system that actually listens to all voters besides DP and GOP voters only, and allows for a clear chance for honest third party challenges.
By locking out Independent voters, the system effectively silences what some estimate to be a third of all voters.