Forecast Model Suggests Democratic Gains Likely in 2018 Gubernatorial Contests
In addition to the entire U.S. House of Representatives and about one-third of the U.S. Senate, Americans will be choosing 36 state governors in 2018. Control of statehouses is crucial not only because many important policy decisions are made at the state level, but because the governors elected next year will, in many cases, play key roles in redrawing congressional and state legislative district lines after the 2020 census. A forecasting model that has produced accurate predictions of the results of midterm U.S. House elections can also be used to predict the results of gubernatorial contests in midterm election years with a high degree of accuracy. The model is based on something called the “generic ballot.” This is a question included in numerous national polls asking voters about which party they prefer in the upcoming U.S. House elections. It turns out that even though the question asks about House elections, the results of this generic ballot test can be used to accurately forecast the gubernatorial seat swing in midterm elections. The president’s party typically loses gubernatorial seats in midterm elections — this has been true in 14 of 18 midterm elections since World War II. The average loss for the