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In a political primary, you have to register by political party.
Political are parties are divisive because they create a division between different ideologies. Party members tend to take their party's entire manifesto to heart, as opposed to weighing the pros and cons of each candidate.
Primary Party (NovaNet) Primary (Apex)
Voting in a CLOSED primary (apex)
A political party's closed primary election is a primary election that is open only to members of the party.
Primary
Democratic Party.
By caucus of members of a political party, by state party conventions, or by primary elections, or by all of the above in some states.
Democrats.
voter in a closed primary
The sounds like a primary election.
the grange organized a political party.