How the primary system works to defeat democracy

Here is a text book on how to avoid responding to the will of the majority of voters:

http://www.truth-out.org/news/item/36408-was-the-democratic-primary-just-manipulated-or-was-it-stolen

The expediency offered by political parties seems to have given us a system wherein the individual voter's preferences are subservient to those of the party.

This is not a good system.