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A Comparison of Primary Election Systems

Primary Type Party Registration List Party Ballot Voter Privacy
  Voters are required to register with a political party. Political parties would receive a list of their party members. Voters are restricted to a single party ballot. The voter's privacy is protected.
Non-Partisan
No party affiliation or identification
N N N Y
Blanket Primary
Voters are able to vote for any candidate regardless of party.
N N N Y
Top 2 Primary
Voters do not register by party. Top 2 candidates, regardless of party, move on to the general election.
N N N Y
Louisiana 'Cajun' Primary
Top two candidates, regardless of party, advance to the general election.
Y Y N N
Pick-a-Party (Open Primary / Private Choice)
Voters must select the ballot of one party
N N Y Y
Open Primary / Public Choice
Same as private choice, but a record is kept of the voter's choice.
N Y Y N
Closed Primary
Voters must register by political party and are restricted to that party's ballot at the primary.
Y Y Y N
Caucus / Convention
Political parties select their nominees to the general election with no primary election
Per party rules Y No Ballot N