Columbia subject headings:
Harvard subject headings:
Communication in politics--United States.
Internet in political campaigns--Europe.
Internet in political campaigns--United States.
Internet--Political aspects--Europe.
Internet--Political aspects--United States
Obama, Barack
Political participation--United States--Computer network resources
Princeton subject headings:
Communication in politics--United States.
Internet in political campaigns--Europe.
Internet in political campaigns--United States.
Internet--Political aspects--Europe.
Internet--Political aspects--United States.
Obama, Barack.
Political participation--United States--Computer network resources.