Although support for the president among members of Congress and public approval of the president?s job performance among members? constituents vary both cross-sectionally and over time, the measures and research designs commonly used in studies of individual members? behavior do not tap and analyze both types of systematic variation jointly. This paper seeks to correct two important limitations of previous research. First, we use a new database of state level surveys (Beyle, Niemi, and Sigelman 2001) to show that constituency level presidential approval is composed of a relatively stable partisan component that varies cross-sectionally, and a dynamic component. Second, we construct 6-month presidential support scores to tap both variation across members of Congress and variation over the course of a year, and we use a panel design that allows us analyze both cross-sectional and dynamic components of the relationship. We find that the two components of constituency level presidential popularity have a statistically significant, but substantively marginal, affect on support in the Senate over the period 1973-2002. The strongest determinants of presidential support among individual members of Congress are party and ideology. [ABSTRACT FROM AUTHOR]