Columbia subject headings:
Opposition (Political science)--United States.
Political participation--United States.
Political parties--United States.
Third parties (United States politics)
Harvard subject headings:
Opposition (Political science)--United States.
Political participation--United States
Political parties--United States
Third parties (United States politics)
Princeton subject headings:
Opposition (Political science)--United States.
Political participation--United States.
Political parties--United States.
Third parties (United States politics)