Final answer:
The party identification of elected leaders at all levels of government is called the party in government, which is responsible for implementing party policies and maintaining party performance.
Step-by-step explanation:
The party identification of elected leaders at all levels of government is referred to as the party in government. In the United States political system, there are three main components of a political party according to political scientist V. O. Key: the party in the electorate, the party organization, and the party in government. The last one, party in government, consists of party identifiers who have been elected or appointed to hold public office and are responsible for implementing the policies on which their party's candidates have run, as well as for the party's overall performance and adherence to the party platform. The party in government operates within a complex system of separation of powers and federalism, making party unity a challenge due to differing constituencies and the design of the political system.