Answer:
Exercised by keeping things off the agenda than keeping them on.
Explanation:
Agenda setting is a term that is generally used to described the deliberate establishment of publicity and interest in important issues by the media houses.
In other words, it explains how the people of influence (in this case, Congress leaders) ensures certain agendas are more often on the table than others, to influence the nation's policies.
Hence, agenda setting a power held by house and senate leaders is often a negative power. Because these congress leaders can "Exercised by keeping things off the agenda than keeping them on."
