6, about 90 million American voters (around 40% of the voting-eligible population, give or take) will elect all 435 members of the U.S. For details about the four forecasts included in this year’s collection, click on the names above. We’d like to thank Campbell for once again convening this collection of forecasts, which is something he does for the Crystal Ball and PS every two years. Explanations of all of these models, as well as Campbell’s introduction, will be appearing in PS: Political Science and Politics. But first, Campbell has an introductory piece explaining these models and the overall midterm environment. Those two models are described in this week’s Crystal Ball. However, these forecasts also address the Senate, and they suggest Republicans are favored to retain control of the upper chamber.

They too forecast a Democratic House takeover, and of a bigger size than the two previously published models. This week, we’re featuring two more models from James Campbell and the team of Charles Tien and Michael Lewis-Beck. Both suggest the Democrats are favored to retake the House majority. So far, we’ve published models from Crystal Ball Senior Columnist Alan Abramowitz and from the team of Joseph Bafumi, Robert Erikson, and Christopher Wlezien. Editor’s Note: In an effort to provide as broad a view as possible to readers about different methods of forecasting the 2018 midterm election, we have been featuring models from respected political scientists that aim to project the net seat change in the U.S.

Midterm elections 2018 house