Who has the most influence on setting the policy agenda? Who sets the policy agenda as to what is the most important issues that Congress should be addressing?

1.)Who has the most influence on setting the policy agenda? Who sets the policy agenda as to what is the most important issues that Congress should be addressing? Is it interest groups, media, businesses, etc? Be sure to back up response with evidence as to why you reached that conclusion?

2.)Does the media has too much influence when it comes to policy making? If so, then how? Is there such think as "fake media"? If so, how do you know when it is true or fake?