The vested interest construct suggests that people act in attitudinally consistent ways on important issues of high hedonic relevance. Accordingly, vested individuals should endorse policies consistent with their attitudes. Symbolic politics holds self-interest unrelated to attitude and thus of little use. Three secondary analyses of national election data assessed the predictive utility of vested interest on policy-related issues. Consistent with expectations, Analysis 1 found vested interest to be unrelated to policy endorsement. However, Analysis 2 disclosed that vested interest significantly moderated attitude-endorsement consistency on beliefs regarding busing, health insurance, and government-guaranteed living standards. Analysis 3 investigated vested interest effects across three national election surveys and six policy issues. Without exception, vested interest significantly moderated the relationship between attitudes and policy endorsement. These results, obtained across a broad range of topics and respondents, suggest that vested interest is an important moderator of consistency between attitudes and policy endorsement. © 2001 Elsevier Science (USA) Coinciding with the development of dual process models of attitude change in social psychology is the complementary consideration of the effect of personal relevance on the behavioral expression of attitudes and on attitude-criterion consistency (Chaiken, 1987;Converse, 1964Converse, , 1970Crano, 1995Crano, , 1997aJohnson & Eagly, 1989;Miller, 1999;Petty & Cacioppo, 1990;Sears & Funk, 1991). From Hovland's time onward, involvement has played a consequential role in theories of attitude (Crano, 2000;Hovland, Janis, & Kelley, 1953). Today's models emphasize these constructs in developing hypotheses regarding the likelihood that a persuasive message will be elaborated and that resultant attitudes will guide future behaviors and policy endorsements (Petty & Krosnick, 1995). Although the precise function of involvement in the attitude-criterion equation is not yet specified, most social psychologists contend that such constructs play a central role in attitude change and attitude-criterion consistency.Two qualities distinguish vested interest from other concepts related to personal involvement. First, vested interest requires that the attitude object be hedonically relevant (Crano, 1995;Sivacek & Crano, 1982). Second, only objects considered important, or consequential, are deemed of high vested interest. Hedonic relevance is concerned with the perceived consequences of the attitude object for the daily life of the respondent 1 An attitude object may be considered important but not hedonically relevant (e.g., a major earthquake in a far-off country) or hedonically relevant but not particularly important. To the extent that either prerequisite is not present, the predictive power of the construct will be diminished. Support for the concept of self-or vested interest in political research can be traced to the pioneering efforts of Muzafir Sherif in his work on...