Colorado independent voters have never been able to vote in major party primaries, until 2018. This article presents evidence gathered by Magellin Strategies about how independent voters will act in Colorado primaries this year.
The standard academic vocabulary for the term “open primary” considers Colorado in 2018 to have a semi-closed primary, not an open primary. But the Colorado media does not conform to the standard academic word usage and says Colorado has an open primary. Actual open primary state do not have registration by party, and there are 19 actual open primary states. Colorado does have registration by party. A semi-closed primary is one in which independents can choose any party’s primary ballot, but members of parties are confined to their own party’s primary ballot.