The impact of campaign activity on voting preferences in union representation elections is investigated using a panel study approach. The context of this study is a four-year, multicampus, university system, in which two faculty unions competed vigorously for representation rights for several years. We propose a multivariate model of individual voting intentions which, we argue, depend on the precampaign expected consequences of collective bargaining, recent changes in institutional conditions, various normative and value constraints, and union campaign activity. Both self-reports of exposure to campaign activity and exogenous measures of campus-specific organizing efforts are used in the analysis. The use of exogenous indicators of campaign activity, which we argue is more appropriate, suggests that campaign activity exerts no appreciable effect on the manner in which individuals vote in such elections. Policy implications of these findings are discussed.