Guttman scaling is the usual procedure for scaling legislative roll-call votes. This paper calls attention to an alternative scaling model—the proximity model. Under this model, legislators approve a consecutive set of items on the scale, without the cumulation required by the Guttman scale. Circumstances under which proximity voting is likely are discussed. Congressional voting on the Compromise of 1850 is analyzed in detail to illustrate the proximity model and to emphasize the possibility of obtaining faulty inferences if one uses the Guttman scale model when it is incorrect. Guttman scaling has been successful for contemporary Congresses, but the proximity model is seen to underlie some issues in the early 1970s. Proximity scaling is not limited to the legislative realm; it can be used in survey analysis and in attitudinal research more generally.