Final answer:
The rules for Democratic Party delegate selection vary, but are generally based on the number of registered party voters in each state. The national parties can also make changes to a state's delegate count. Different methods of selecting party nominees, such as primaries and caucuses, have their own rules and variations.
Step-by-step explanation:
The rules for how Democratic Party delegates are chosen vary depending on the state and the party. Delegates are typically chosen based on the number of registered party voters in each state. For example, California, with the most Democrats, sends more delegates to the Democratic National Convention than a state like Wyoming with fewer Democrats. The national parties can also change the delegate count of a state to increase or reduce its say in the nominee selection process. Additionally, there are different methods of picking party nominees, such as primaries and caucuses, which have their own set of rules and variations.