Question: If the general election were held today, and the candidates were [Theresa Greenfield for the Democrats] and [Joni Ernst for the Republicans], for whom would you vote—[Theresa Greenfield], [Joni Ernst], someone else, or would you not vote?

About this Poll
The Iowa Poll, conducted September14-17for The Des Moines Register and Mediacom by Selzer & Co. of Des Moines, is based on telephone interviews with 803 Iowans ages 18 or older. Interviewers with Quantel Research contacted households with randomly selected landline and cellphone numbers supplied by Dynata. Interviews were administered in English. Responses were adjusted by age, sex, and congressional district to reflect the general population based on recent American Community Survey estimates.

Questions based on the sample of 803 Iowa adults have a maximum margin of error of plus or minus 3.5 percentage points, and questions based on the sample of 658 likely voters in the 2020 general election have a maximum margin of error of plus or minus 3.8 percentage points. This means that if this survey were repeated using the same questions and the same methodology, 19 times out of 20, the findings would not vary from the true population value by more than plus or minus 3.5 or 3.8 percentage points, respectively. Results based on smaller samples of respondents—such as by gender or age—have a larger margin of error.