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The Iowa Supreme Court adopted an unpopular but unanimous ruling in Varnum v. Brien, which established same-sex marriage. Using a unique panel study conducted immediately before and after the court decision, we evaluate the impact of policy adoption on changing opinions on minority rights. The signaling of new social norms pressured some respondents to modify their expressed attitudes. We find that respondents whose demographic characteristics would predict support for marriage equality, but previously did not, were more likely to shift their opinions to be consistent with the new state law. A policy feedback mechanism may be responsible for the rapid diffusion of laws legalizing same-sex in the states. [ABSTRACT FROM PUBLISHER]

How do the justices of the Supreme Court make their decisions? How does the Supreme Court of the United States make its decisions? The answer to these questions may not be the same. In studying judicial decision making, there has been a disconnection between individual and institutional levels of analysis. Lifetime tenure insulates individual justices and permits them to act on their substantive preferences. At the same time, the Court lacks the "sword and purse" and must rely on the other branches to fund or implement its directives. This study develops an integrative model to explain Supreme Court decision making. Using constitutional civil liberties and civil rights cases in the 1953 to 2000 period, conditions favorable to the attitudinal model, we find that institutional decision making is a function of attitudinal, strategic, and legal factors. [ABSTRACT FROM AUTHOR]