Polls and Votes

This article revises, updates, and examines the background for a highly accurate model for forecasting the national two-party popular vote in presidential elections. The model provides a vote prediction in early September based on Gallup trial-heat or presidential preference polls and the (nonannualized) rate of economic growth in the second quarter of the election year. It is estimated over the 12 presidential elections from 1948 to 1992. The mean absolute error of the model's out-of-sample postdictions is less than 1 1/3 percentage point, and its actual error in predicting the 1992 vote was about half a percentage point. The article also assesses the reasons for confidence in the model, as well as an approach to gauging uncertainty in any specific forecast. The reasons presidential elections can be forecast at or before the beginning of the general election campaign also are explored. Finally, the forecasting model is applied to the 1996 presidential campaign between Clinton and Dole.

[1]  George Gallup,et al.  The Gallup Poll; Public Opinion, 1935-1971 , 1972 .

[2]  Domestic Commerce,et al.  Survey of current business , 1921 .

[3]  R. Fair.  The Effect of Economic Events on Votes for President: 1980 Results , 1982 .

[4]  Thomas M. Holbrook.  Presidential Elections in Space and Time , 1991 .

[5]  P. Rousseeuw.  Least Median of Squares Regression , 1984 .

[6]  Peter J. Rousseeuw,et al.  Robust regression and outlier detection , 1987 .

[7]  R. Fair.  The effect of economic events on votes for president: 1992 update , 1996 .

[8]  Michael S. Lewis-Beck,et al.  Forecasting presidential elections: A comparison of naive models , 1984 .

[9]  Jay P. Greene.  Forewarned Before Forecast: Presidential Election Forecasting Models and the 1992 Election. , 1993, PS: Political Science & Politics.

[10]  Of Time and Presidential Election Forecasts , 1996 .

[11]  H. Norpoth.  Is Clinton Doomed? An Early Forecast for 1996 , 1995 .

[12]  S. Kernell.  Guide to U.S. Elections , 1977, American Political Science Review.

[13]  D. Hibbs.  The American Political Economy , 1987 .

[14]  James E. Campbell.  Southern Political Science Association The Presidential Pulse and the 1994 Midterm Congressional Election , 2007 .

[15]  J Scottarmstrong,et al.  Forecasting presidential elections , 1986 .

[16]  James E. Campbell.  The presidential pulse of congressional elections , 1993 .

[17]  Irving Crespi,et al.  Pre-Election Polling: Sources of Accuracy and Error , 1990 .

[18]  Ray C. Fair,et al.  The Effect of Economic Events on Votes for President , 1978 .

[19]  M. Lewis-Beck.  Election Forecasts in 1984: How Accurate Were They? , 1985 .

[20]  Ray C. Fair,et al.  The effect of economic events on votes for president: 1984 update , 1987 .

[21]  E. Tufte,et al.  Political Control of the Economy. , 1980 .

[22]  James E. Campbell,et al.  Trial-Heat Forecasts of the Presidential Vote , 1990 .

[23]  James E. Campbell.  Forecasting the Presidential Vote in the States , 1992 .