Abstract
This paper presents a unidimensional spatial model of voting in which members of Congress vote based on an imprecise perception of roll-call alternatives. The model is applied to the Senate roll-call votes of 1977 to estimate the ideal points of the senators, and to examine the role of a liberal-conservative dimension in describing votes on economic issues relative to social issues. In light of the spatial model, the paper argues that “standard” models of roll-call voting are not based on a theory of choice, and hence, that it is difficult to interpret their results. Alternatives to standard models, based on the spatial model, are developed and are used to analyze the role of ideology in deciding a specific economic issue: coal strip-mining.
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