Columbia subject headings:
Middle class--United States.
Political parties--United States.
Political parties.
Politics, Practical.
Social classes.
United States--Politics and government.
Harvard subject headings:
Middle class--United States.
Political parties--United States
Political parties.
Politics, Practical.
Social classes.
United States--Politics and government.
Princeton subject headings:
Middle class--United States.
Political parties--United States.
Political parties.
Politics, Practical.
Social classes.
United States--Politics and government.