what states have had primaries and caucuses
States choose whether they want to hold primaries or caucuses. Most states hold primaries but states like Iowa, Louisiana, Minnesota and Maine use the caucus system.
Caucuses were once the most common way of choosing presidential nominees. Today, Alaska, Colorado, Hawaii, Kansas, Maine, Minnesota, Nevada, North Dakota, Wyoming and Iowa are the only states to rely solely on the caucus, according to the Federal Election Commission.