| Results of SurveyUSA News Poll #11137 |
 | Do you approve or disapprove of the job Charles Grassley is doing as United States Senator? |
| 600 Adults | All | Gender | Age | Race | Party Affiliation | Ideology | Abortion | Gun Ownership | Labor Union | Region | ||||||||||||||||
| Margin of Sampling Error: ± 3.9% | Male | Female | 18-34 | 35-54 | 55+ | White | Black | Hispanic | Other | Republic | Democrat | Independ | Conserva | Moderate | Liberal | Pro-life | Pro-choi | Yes | No | Yes | No | Northeas | Southeas | Southwes | Northwes | |
| Approve | 65% | 66% | 64% | 53% | 69% | 72% | 66% | ** | ** | ** | 86% | 55% | 68% | 86% | 64% | 52% | 74% | 62% | 70% | 66% | 62% | 69% | 63% | 66% | 65% | 68% |
| Disapprove | 27% | 27% | 26% | 29% | 26% | 25% | 26% | ** | ** | ** | 10% | 37% | 27% | 11% | 31% | 39% | 18% | 33% | 25% | 26% | 32% | 24% | 25% | 29% | 27% | 27% |
| Not Sure | 8% | 7% | 10% | 17% | 6% | 3% | 8% | ** | ** | ** | 4% | 9% | 5% | 4% | 5% | 9% | 8% | 5% | 5% | 9% | 6% | 7% | 12% | 4% | 8% | 5% |
| Total | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% |
| Composition of Adults | 100% | 48% | 52% | 30% | 38% | 31% | 94% | 2% | 2% | 2% | 28% | 38% | 31% | 29% | 43% | 18% | 45% | 51% | 47% | 51% | 24% | 74% | 41% | 20% | 21% | 18% |
 | Do you approve or disapprove of the job Tom Harkin is doing as United States Senator? |
| 600 Adults | All | Gender | Age | Race | Party Affiliation | Ideology | Abortion | Gun Ownership | Labor Union | Region | ||||||||||||||||
| Margin of Sampling Error: ± 4.1% | Male | Female | 18-34 | 35-54 | 55+ | White | Black | Hispanic | Other | Republic | Democrat | Independ | Conserva | Moderate | Liberal | Pro-life | Pro-choi | Yes | No | Yes | No | Northeas | Southeas | Southwes | Northwes | |
| Approve | 53% | 50% | 57% | 50% | 50% | 60% | 53% | ** | ** | ** | 30% | 75% | 52% | 29% | 66% | 68% | 41% | 67% | 50% | 60% | 62% | 52% | 52% | 51% | 58% | 55% |
| Disapprove | 40% | 44% | 36% | 41% | 43% | 35% | 40% | ** | ** | ** | 66% | 18% | 44% | 66% | 30% | 26% | 52% | 27% | 47% | 32% | 32% | 41% | 40% | 43% | 37% | 40% |
| Not Sure | 7% | 6% | 7% | 9% | 6% | 4% | 7% | ** | ** | ** | 4% | 7% | 4% | 5% | 4% | 6% | 6% | 5% | 4% | 8% | 5% | 6% | 8% | 6% | 5% | 6% |
| Total | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% |
| Composition of Adults | 100% | 48% | 52% | 30% | 38% | 31% | 94% | 2% | 2% | 2% | 28% | 38% | 31% | 29% | 43% | 18% | 45% | 51% | 47% | 51% | 24% | 74% | 41% | 20% | 21% | 18% |