Final answer:
The parties involved in the San Bernardino Case Study are the California Democratic Party, the California Republican Party, and the California Libertarian Party. The Supreme Court agreed with their argument regarding the right to determine party association and participation in choosing the party nominee.
Step-by-step explanation:
The parties involved in the San Bernardino Case Study are the California Democratic Party, the California Republican Party, and the California Libertarian Party. These parties brought a case to the Supreme Court in 2000, arguing that they have the right to determine who associates with the party and who participates in choosing the party nominee. The Supreme Court agreed, limiting the states' choices for nomination methods to closed and open primaries.