| Results of SurveyUSA News Poll #8262 |
 | 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 | Education | Attend Church | Abortion | Region | |||||||||||||||||||
| Margin of Sampling Error: ± 3.9% | Male | Female | 18-34 | 35-54 | 55+ | White | Black | Hispanic | Other | Republic | Democrat | Independ | Conserva | Moderate | Liberal | Grad Sch | College | Some Col | No Colle | Never | Occasion | Regularl | Pro-life | Pro-choi | Northeas | Southeas | Southwes | Northwes | |
| Approve | 65% | 64% | 65% | 62% | 65% | 68% | 65% | ** | ** | ** | 78% | 58% | 62% | 76% | 60% | 60% | 62% | 80% | 65% | 60% | 59% | 63% | 71% | 74% | 59% | 61% | 67% | 64% | 71% |
| Disapprove | 27% | 28% | 26% | 25% | 28% | 28% | 28% | ** | ** | ** | 17% | 35% | 28% | 18% | 30% | 38% | 31% | 16% | 25% | 31% | 31% | 28% | 23% | 19% | 34% | 31% | 23% | 27% | 24% |
| Not Sure | 8% | 8% | 9% | 13% | 7% | 5% | 7% | ** | ** | ** | 5% | 6% | 11% | 6% | 10% | 2% | 7% | 5% | 10% | 9% | 10% | 9% | 6% | 7% | 8% | 8% | 10% | 9% | 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% | 100% | 100% | 100% |
| Composition of Adults | 100% | 48% | 52% | 30% | 38% | 32% | 94% | 2% | 2% | 2% | 27% | 29% | 43% | 36% | 43% | 17% | 15% | 22% | 23% | 39% | 23% | 33% | 44% | 44% | 51% | 37% | 22% | 22% | 19% |
 | 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 | Education | Attend Church | Abortion | Region | |||||||||||||||||||
| Margin of Sampling Error: ± 4.1% | Male | Female | 18-34 | 35-54 | 55+ | White | Black | Hispanic | Other | Republic | Democrat | Independ | Conserva | Moderate | Liberal | Grad Sch | College | Some Col | No Colle | Never | Occasion | Regularl | Pro-life | Pro-choi | Northeas | Southeas | Southwes | Northwes | |
| Approve | 52% | 50% | 54% | 46% | 55% | 55% | 51% | ** | ** | ** | 32% | 76% | 48% | 36% | 59% | 69% | 53% | 52% | 50% | 53% | 68% | 51% | 45% | 39% | 63% | 56% | 51% | 50% | 50% |
| Disapprove | 40% | 43% | 37% | 40% | 40% | 39% | 41% | ** | ** | ** | 61% | 19% | 41% | 59% | 30% | 28% | 41% | 41% | 43% | 38% | 22% | 42% | 48% | 53% | 30% | 36% | 41% | 42% | 44% |
| Not Sure | 8% | 6% | 9% | 13% | 5% | 6% | 8% | ** | ** | ** | 6% | 5% | 10% | 5% | 10% | 4% | 6% | 7% | 7% | 9% | 10% | 7% | 7% | 8% | 7% | 8% | 9% | 8% | 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% | 100% | 100% | 100% |
| Composition of Adults | 100% | 48% | 52% | 30% | 38% | 32% | 94% | 2% | 2% | 2% | 27% | 29% | 43% | 36% | 43% | 17% | 15% | 22% | 23% | 39% | 23% | 33% | 44% | 44% | 51% | 37% | 22% | 22% | 19% |