Explain the types of primaries used in the United States.  What type does California have?

In the United States, there are four main types of primaries: open primaries, closed primaries, semi-closed primaries, and semi-open primaries.

1. Open Primaries: In an open primary, voters of any affiliation may vote in the primaries of any party. They need not be a member of that party in order to vote.

2. Closed Primaries: In a closed primary, only voters registered with the party can vote.

3. Semi-closed Primaries: In a semi-closed primary, as with closed primaries, registered party members can vote in their respective party's primary. However, it also allows unaffiliated voters to participate as well. Depending on the state, independents either make their choice of party primary privately, inside the voting booth, or publicly, by registering with any party on Election Day.

4. Semi-open Primaries: In a semi-open primary, anyone of any political affiliation can vote, but they must either publicly declare their party preference in front of the election officials or request a specific party's ballot in the voting booth.

As for California, it uses a system known as a "top-two primary" or "jungle primary". In this system, all candidates, regardless of party affiliation, are listed on the same primary ballot. The top two winners, regardless of party, move on to the general election. This system is used for most state-level offices and congressional races, but not for presidential elections. For presidential primaries, California uses a modified closed primary, where the Democratic Party allows unaffiliated voters to participate, but the Republican Party does not.