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The Nationalization of Special Elections for the U.S. House of Representatives

Abstract Scholars and political commentators have argued that special elections to the U.S. House of Representatives are national contests, serving as a referendum on the president's party and a predictor of future election outcomes (Sigelman 1981; Smith and Burnnell 2010). But the empirical record is mixed, with one leading study demonstrating that candidate and district characteristics alone explain special election outcomes (Gaddie, Bullock, and Buchanan 1999). We investigate this disagreement by comparing special election and open-seat results using new data for the period 1995–2014. We find that while candidate characteristics affect special election outcomes, presidential approval is predictive of special election outcomes as well. Furthermore, we find that the effect of presidential approval on special election outcomes has increased in magnitude from 1995 to 2014, with the 2002 midterm representing an important juncture in the nationalization of special elections. We conclude that special elections have developed into national contests since the 1970s and situate this development within broader electoral trends.