Columbia subject headings:
Political parties--United States.
United States--Politics and government--20th century.
United States. Congress--Leadership.
United States. Congress. Senate--Majority whips.
United States. Congress. Senate--Minority whips.
Harvard subject headings:
Coalitions--United States.
Political parties--United States
United States--Politics and government--1945-1989.
United States--Politics and government--1989-
United States. Congress. House--Majority whips.
United States. Congress. House--Minority whips.
United States. Congress. Senate--Majority whips.
United States. Congress. Senate--Minority whips.
Princeton subject headings:
Coalitions--United States.
Political parties--United States.
United States--Politics and government--1945-1989.
United States--Politics and government--1989-
United States. Congress. House--Majority whips.
United States. Congress. House--Minority whips.
United States. Congress. Senate--Majority whips.
United States. Congress. Senate--Minority whips.