Abstract
We consider the degree of ideological polarizationwithin and between the parties in the U.S. House ofRepresentatives for the period 1963–1996, using theGroseclose, Levitt and Snyder (1996) adjustment method for ADA and ACU scores to ensure over timecomparability of roll call voting data. We focusespecially on the median House member, since webelieve that change in the median offers a bettermeasure of the impact of the change in party controlthan does changes in the mean roll-call votingscore.
Our data analysis makes two general points. First andforemost, when we looked at the change in the locationof the House median voter, we found a dramatic changeafter the Republicans gained a majority in the House in1994. After the Republicans became a majority in theHouse, the ADA median in the House in 1995–1996 was at24, far closer to the Republican median of 4 than tothe Democratic median of 83. The shift in medianfrom 1993–1994 to 1994–1995 involved a change of over 25points in one election – far and away the greatestsingle shift in ideology of the modern era. Incontrast, the mean changed only 1 point overthis same period. Second, for the three decades weinvestigated, we found three historical epochs vis a visthe relative locations of the ADA (or ACU) floormedian and the ADA (or ACU) floor mean in the U.S.House of Representatives – two inflection points in1983 and 1994 which are related to trends in regionalrealignment.
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Grofman, B., Koetzle, W., Merrill, S. et al. Changes in the Location of the Median Voter in theU.S. House of Representatives, 1963–1996. Public Choice 106, 221–232 (2001). https://doi.org/10.1023/A:1005250500200
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DOI: https://doi.org/10.1023/A:1005250500200