What relation is between politic and economic? The research question of this paper is the macroeconomic impact on partisanship in U.S.A.; i.e., Whether the economic performances of the American government could influence citizens' partisanships or not? Six regression equations for the partisanship model have been constructed in this study. Unfortunately, none of them reach the significant level. So, we fail to reject the null hypothesis: the economic conditions cannot influence the voting rates for political parties in American Presidential elections. This research finding is consistent with Kramer's (1971: 141) declaration: ”Presidential elections are substantially less responsive to economic conditions.”