A nonpartisan blanket primary is a primary election in which all candidates for the same elected office, regardless of respective political party, run against each other at once, instead of being segregated by political party. It is also known as a jungle primary, qualifying primary, or top-two primary.
However, unlike a closed primary, independents are allowed to choose to vote in any party’s primary. There are thirteen states that have semi-closed primaries: Alaska, Arizona, Colorado, Iowa, Kansas, Massachusetts, New Hampshire, North Carolina, Oregon, Rhode Island, Utah, West Virginia, and Wyoming.
In a semi-open primary, a registered voter does not need to publicly declare which political party’s primary they will vote in before entering the voting booth. Voters will inform election officials. The main difference between a semi-open primary and an open primary is the use of a party-specific ballot.