At the beginning of each Congress, members meet to organize and select their leaders. Democrats call their party organization the Democratic Caucus; Republicans call their party organization the Republican Conference. Within the caucus and conference are numerous entities that assist party leaders in determining the work and role of the members of that party. This significant book presents historical background, including service dates, party affiliation, and other information for 15 House and Senate party leadership posts. The various duties and obligations of the party leaders are described along with the structure of the party organization.