Columbia subject headings:
Divided government--United States.
Political culture--United States.
Political parties--United States.
Two-party systems--United States.
United States--Politics and government--21st century.
United States. Congress--Reform.
United States. Congress.
Harvard subject headings:
Political parties--United States--21st century.
United States--Politics and government--21st century.
United States. Congress--Reform.
United States. Congress.
Princeton subject headings: