Time of final vote decision in a national presidential election campaign was explored as the dependent variable in a media effects study conducted earlier as part of the National Election Study of 1980. Political identity, a new measure of partisanship and independence known as the Partisan Supporter Typology, was used as an important contingent condition for political communication effects. Hierarchical regression was used to assess the relative contribution of political identity, other political predispositional factors, and media use in the time voting decisions were made. Results indicated that most of the explained variance at the time of final vote decision could be explained by political identity and predispositional variables, such as political activity and caring which party wins the election. (Author/DF)