Caucus —made in heaven for community organizers. Obama used it to steal a lot of votes from Hillary.
Here’s how the caucus system works in MN.
Precinct caucus: An opportunity to corral people to hand out literature. Non-binding straw poll taken and immediately forgotten. Elect delegates to country convention (anyone who wants to can go).
County Convention: An opportunity to corral people to hand out literature. Non-binding straw poll taken and immediately forgotten. Elect delegates to State convention (Only party elites get elected).
State Convention: All party business including endorsing candidates gets done by party insiders.