When searching for campaign effects in modern elections, agenda setting according to principles of issue ownership is a possible candidate. When parties or candidates campaign on issues they own, issue ownership theory predicts they will receive an electoral boost. However, the current understanding of issue ownership does not distinguish the theories of issue ownership nor does it provide comprehensive evidence for issue ownership effects. Using data on U.S.Presidential and Senatorial Elections from 1980-2004, this paper fills in current gaps in issue ownership theory. Results show support for the Campaign Effects model of issue ownership in both Senatorial and Presidential Elections.