Measuring Issue Salience
Lee Epstein and Jeffrey A. Segal

American Journal of Political Science 44 (January): 66-83 (2000).
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Abstract
The concept of issue salience has figured prominently in many studies of American political life. Long lines of research have taught us that both citizens and political elites may respond differently to issues that are salient to them than to those that are not. Yet analysts making such claims about elite actors face a fundamental problem that their counterparts in mass behavior do not: They cannot survey, say, members of the Supreme Court to ascertain those cases that are especially salient to the justices. Rather, scholars must rely on surrogates for issue salience-surrogates that are fraught with problems and that have led to disparate research results.

Accordingly, we offer an alternative approach to measure issue salience for elite actors: the coverage the media affords to a given issue. We argue that this approach has substantial benefits over those employed in the past. Most notably, it provides a reproducible, valid, and transportable method of assessing whether the particular actors under investigation view an issue as salient or not. In making the case for our measure we focus on Supreme Court justices but we are sanguine about its applicability to other political actors.

keywords: issue salience, Supreme Court, media coverage, judicial behavior, contemporaneous salience, political elites, case importance, New York Times, empirical analysis, judicial politics