In this paper we present a theoretical framework for the study of ''pu
blic mood.'' We define public mood as a diffuse affective state, havin
g distinct positive and negative components, that people experience be
cause of their membership in a particular political community, Drawing
on several different literatures, we present a typology of the etiolo
gy of public mood. Public mood has multiple origins, including chronic
predisposing factors, personal and collective experiences, and discre
te emotional responses to short-term events. Using a local survey, we
provide a preliminary investigation of the usefulness of the typology.
We then discuss some of the consequences of public mood for evaluatio
ns and judgments. We argue that public mood functions as an additional
consideration in the formation of attitude responses. In our test of
this idea, we find that public mood is quite influential in shaping at
titudes, even when controlling for other causes.