The correct answer is D) running the party at the national and state levels
The main responsibility of a party organization is running the party at the national and state levels.
The Party has to develop a platform and chose the right candidates to fill the political offices at the national and state levels. These political parties support their candidates during campaigns and organize different rallies, events. In the United States, a bipartisan system has dominated US politics in which the Democratic Party and the Republican Party have split power over the years.