Two experiments sustain Lippmann's suspicion, advanced a half century ago, that media provide compelling descriptions of a public world that people cannot directly experience. More precisely, the experiments show that television news programs profoundly affect which problems viewers take to be important. The experiments also demonstrate that those problems promimently positioned in the evening news are accorded greater weight in viewers' evaluations of presidential performance. We note the political implications of these results, suggest their psychological foundations, and argue for a revival of experimentation in the study of political communication.
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