What interests are represented by the United States government?

What interests are represented by the United States government? How do interest groups play a role in those being represented? Be sure to discuss the roles, functions, and processes by which these groups operate referring not to just the groups themselves but also lobbyists.
· How does public opinion influence the government?
· What makes the media powerful? How much influence should it truly have over citizens and their perception of politics in the United States. How the media is able to shape public opinion and sway policy based on the representation it gives to any given person or issue. Discuss this with clear cut arguments