What characterizes a closed primary?

A closed primary is characterized by the requirement that only registered members of a political party can vote in that party's primary election. This system is designed to ensure that the candidates selected to run in the general election truly represent the interests and preferences of the party's base. By restricting participation to registered party members, the party can maintain control over its nomination process and ensure that voters are aligned with the party's values and policies.

The emphasis on party membership in a closed primary also aims to discourage crossover voting, where voters from other parties might attempt to influence the outcome of the primary in a way that could undermine the party's preferred candidates. This fosters a more cohesive and united front within the party in preparation for the general election.