5. The idea that political power should be distributed and shared among various groups in society is known as A. centrism. B. pluralism. C. socialism. D. libertarianism. 6. Which political party in the United States had the longest continuous existence? A. Democrats B. Federalists C. Progressives D. Republicans 7. Who are the main sponsors of political action committees (PACs)? A. think tanks B. third parties C. interest groups D. grassroots organizations 8. Which of these is the best example of grassroots mobilization? A. a public demonstration B. a political party convention C. a meeting with policymakers D. a paid television advertisement