This is a caucus not a primary. From what I understand there are no ballots at all - you physically walk around the room until you find the group you want to support, if your group is large enough to choose delegates (generally there are more slots than people to fill them) to the next convention. The delegates are in theory (in practice it is different) not required to vote for you, so when your group chooses people you need to make sure they are like minded.