A political party broadcast is considered as a/an

A political party broadcast is regarded as a closed text, one that steers the audience toward a single preferred meaning.

It is built to promote a fixed message and discourage alternative or oppositional readings of what is shown.

Such a text limits interpretive freedom, guiding viewers firmly to the party's intended conclusion.

Calling it an open text is wrong, since an open text invites many readings and leaves meaning genuinely negotiable, unlike partisan persuasion.

Describing it as a lengthy text confuses meaning with duration, for length says nothing about how tightly meaning is controlled.

Naming it a liberal text is also mistaken, as the term does not denote a recognised category of textual openness here.