Columbia subject headings:
Elections--United States.
Political campaigns--United States.
Presidents--United States--Election--2012.
United States--Politics and government--2009-2017.
United States. Congress--Elections, 2012.
United States. Congress--Elections, 2014.
Harvard subject headings:
Elections--United States
Presidents--United States--Election--2012.
United States--Politics and government--2009-2017.
United States. Congress--Elections, 2012.
United States. Congress--Elections, 2014.
Voting--United States
Princeton subject headings:
Elections--United States.
Presidents--United States--Election--2012.
United States--Politics and government--2009-.
United States. Congress--Elections, 2012.
United States. Congress--Elections, 2014.
Voting--United States.