Columbia subject headings:
Liberalism--United States.
United States--Politics and government--1945-1989.
United States. Congress. Senate.
Harvard subject headings:
Liberalism--United States.
United States--Politics and government--1945-1989.
United States. Congress. Senate.
Princeton subject headings:
Liberalism--United States.
United States--Politics and government--1945-1989.
United States. Congress. Senate