“…Later research challenged the idea that partisanship was a fixed trait of voters and characterized it as endogenous, more of a "running tally" of the voter's evaluations of the parties than an immutable attachment (Jackson 1975;Fiorina 1981). As noted above, this debate about the stability of macropartisanship continues with Erikson, MacKuen, and Stimson (2002) and Box-Steffensmeier and Smith (1996), emphasizing its changeability, and Abramson and Ostrom (1991) and Green, Palmquist, and Schickler (1998;2001, and) emphasizing its stability. NOTE.-Macropartisanship is computed as the percentage of partisans who identified with the Democratic party.…”