Final answer:
The main argument from the dissenting opinion was that the 'blanket primary' violated the First Amendment rights of political parties.
Step-by-step explanation:
Main Argument from the Dissenting Opinion in California Democratic Party v. Jones
In California Democratic Party v. Jones, the Supreme Court ruled on the 'blanket primary' system where all candidates, regardless of party, appeared on the same ballot. The main argument from the dissenting opinion was that the blanket primary violated the First Amendment rights of political parties. According to the dissent, forcing parties to allow non-members to participate in their nomination process infringes on their freedom of association.
The dissenting judges argued that political parties have the right to determine membership criteria and select candidates according to their own party platforms and principles. Allowing non-party members to influence the nomination process could dilute the party's message and undermine its internal decision-making. The dissenting opinion contended that the state's interest in promoting voter choice did not outweigh the parties' constitutional rights.
Learn more about Supreme Court ruling on the 'blanket primary' system