NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

An Econometric Evaluation of Competing Explanations for The Midterm Gap

Brian G. Knight

NBER Working Paper No. 20311
Issued in July 2014
NBER Program(s):   POL

This paper provides a unified theoretical and empirical analysis of three longstanding explanations for the consistent loss of support for the President’s party in midterm Congressional elections: (1) a Presidential penalty, defined as a preference for supporting the opposition during midterm years, (2) a surge and decline in voter turnout, and (3) a reversion to the mean in voter ideology. To quantify the contribution of each of these factors, we build an econometric model in which voters jointly choose whether or not to participate and which party to support in both House and Presidential elections. Estimated using ANES data from both Presidential and midterm years, the model can fully explain the observed midterm gaps, and counterfactual simulations demonstrate that each factor makes a sizable contribution towards the midterm gap, with the Presidential penalty playing the largest role.

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This paper was revised on November 10, 2015

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Document Object Identifier (DOI): 10.3386/w20311

Published: Brian Knight, 2017. "An Econometric Evaluation of Competing Explanations for the Midterm Gap," Quarterly Journal of Political Science, vol 12(2), pages 205-239.

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