Add Minnesota to that list. There is no party registration here. Anyone can attend and vote in the caucus as long as they meet these requirements.
Anyone can attend a precinct caucus to observe. You can participate and vote in a party’s caucus if you:
Will be eligible to vote on the general election day for that year;
Reside in the precinct on caucus day;
Agree with the party’s principles; and
Have not participated in another party’s precinct caucus.
Before anyone latches on to “Agree with the party’s principles”
Democrats lie. Its what they do.