Citizens might choose to join a political party because joining a political party might help them to vote in a closed primary.
There are many reasons why people choose to join political parties, specifically due to esteem and popularity. People obsessed with being famous and want to have a good fame in the society for which they usually join the political party.
Voting in an open primary does not require people to be part of a particular political party but to vote in a closed primary, it is mandatory to be a part of a political party.
If someone is interested to vote in a closed primary, then they do need to be a part of a Specific political party.
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