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1997-09-01

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Political Research Quarterly
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Oppenheimer, Stimson, and Waterman's exposure thesis of partisan change contends that shifts in the partisan composition of Congress are related to the long-term stability of the electoral system. Applying their exposure model to elections from 1962-1994 produces seat change estimates that generally follow the actual data pattern, but these estimates produce large predictive errors. When the exposure model is reestimated using data from 1962-1994, exposure is not significantly related to partisan seat swings. This article advances a seat change model that relies on an alter nate measure of exposure: the net exposure of the president's party in open seats. Open-seat exposure is significantly related to the partisan seat swing, and substantially improves on the economic evaluation/surge and-decline/ exposure model of seat change. In an era of high incumbent security and strategic retirement from Congress, the balance of open seats is a better indicator of partisan vulnerability, and better reflects the nature of partisan exposure.

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Gaddie, R. K. (1997). Congressional Seat Swings: Revisiting Exposure in House Elections. Political Research Quarterly, 50(3), 699-710. doi: 10.1177/106591299705000310

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