Presidents engage in by focusing on topics, such as health care, that they believe are most important while avoiding topics marginal groups find important.

Agenda setting

Explanation:

Agenda setting is defined as subject or issue that is put up as agenda among the people which is impacted by a person's belief.Discussion on that particular issue is done by people to display their thoughts and perception on that agenda.

Agenda can be set by political groups, media, news etc.It helps the audience understand the importance of subject as it has been put up as agenda.According to the question, President is giving importance to the subject of health care by setting it as agenda among audience and ignoring the issue of marginal groups.