Why do political parties and interest groups use mass media?

to furnish information and encourage knowledge
to promote their positions and influence public opinion
to provide amusement and entertainment
to sell products and services to consumers

and potential donors

to raise awareness about their cause or agenda
to recruit new members and supporters
to shape the narrative and frame issues in a particular way
to respond to criticism and defend their views or actions
to mobilize voters and rally support for elections or policy initiatives.