Iowa 2016 Senate Election Polls
| Source | Date | Sample | Grassley | Judge | Other | |
|---|---|---|---|---|---|---|
| Poll Averages† | 56.3% | 35.0% | - | |||
| Loras College | 11/05/2016 | 500 LV | 53% | 37% | 10% | |
| Loras College | 11/05/2016 | 500 LV | 53% | 37% | 10% | |
| Selzer & Co. | 11/05/2016 | 800 LV | 56% | 33% | 11% | |
| Emerson College | 11/04/2016 | 700 LV | 60% | 32% | 8% | |
| Quinnipiac | 10/28/2016 | 791 LV | 56% | 38% | 6% | |
| Loras College | 9/26/2016 | 491 LV | 54% | 37% | 9% | |
| Quinnipiac | 9/23/2016 | 612 LV | 55% | 43% | 2% | |
| Monmouth University | 9/15/2016 | 404 LV | 56% | 39% | 5% | |
| RABA Research | 9/12/2016 | 1,054 LV | 50% | 37% | 13% | |
| Public Policy | 9/07/2016 | 827 LV | 49% | 43% | 8% | |
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†The average includes the most recent poll from each source within the past 30 days, up to a maximum of five. If five polls are found, and there are other qualifying polls on that same calendar date, those will also be included.
