A reddit style website for political parties to refine their platform.  The users would submit ideas and then they would be edited for clarity.  The users would vote on each change.  the users would use real names and vote with their name.  each party could establish rules for behavior on their site.  This would not replace a primary but could replace the caucus portion.

This idea makes the caucus process better for those that speak a different primary language, those who are hearing impaired, shy introverts who don't want to stand up to talk, single parents, working poor and all those without time to spend a tuesday night at their local elementary school.   Not that the in person caucus couldn't work with this system, but each idea discussed would have to be typed into the website for future online discussion.