It's logical and fair to allow only registered or self-identified Democrats to choose their party's nominee (although numerous states do have open primaries). Letting more non-Democrats choose the nominee doesn't guarantee success in a November general election. And it does nothing to encourage people to join and work for the party.

Centrist voters typically decide general elections, so hard-left or hard-right platforms don't help.

Sanders insists the party adopt 'the most progressive platform ever passed' at its Philadelphia convention. Since when does the runner-up get to dictate the platform?

William M. Daley Quotes