| Results of SurveyUSA News Poll #9965 |
 | 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: ± 4% | 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 | 62% | 61% | 63% | 59% | 64% | 62% | 62% | ** | ** | ** | 78% | 53% | 53% | 75% | 59% | 57% | 57% | 59% | 66% | 60% | 49% | 61% | 69% | 70% | 57% | 66% | 52% | 57% | 68% |
| Disapprove | 31% | 35% | 27% | 30% | 31% | 33% | 31% | ** | ** | ** | 18% | 40% | 38% | 23% | 34% | 40% | 37% | 37% | 28% | 27% | 42% | 30% | 26% | 24% | 38% | 27% | 38% | 37% | 25% |
| Not Sure | 7% | 4% | 10% | 12% | 5% | 5% | 7% | ** | ** | ** | 4% | 7% | 9% | 2% | 8% | 3% | 5% | 3% | 6% | 13% | 8% | 9% | 5% | 6% | 5% | 6% | 10% | 5% | 7% |
| 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% | 32% | 35% | 29% | 29% | 41% | 18% | 19% | 20% | 39% | 21% | 26% | 34% | 41% | 42% | 51% | 40% | 19% | 21% | 21% |
 | 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 | 55% | 50% | 59% | 53% | 57% | 54% | 56% | ** | ** | ** | 36% | 74% | 54% | 33% | 66% | 70% | 60% | 52% | 52% | 59% | 59% | 54% | 54% | 42% | 69% | 56% | 55% | 58% | 48% |
| Disapprove | 39% | 45% | 33% | 37% | 39% | 40% | 37% | ** | ** | ** | 57% | 21% | 38% | 62% | 29% | 29% | 35% | 43% | 42% | 29% | 33% | 38% | 42% | 51% | 28% | 37% | 37% | 39% | 43% |
| Not Sure | 7% | 4% | 9% | 10% | 4% | 7% | 7% | ** | ** | ** | 7% | 5% | 8% | 5% | 5% | 2% | 5% | 5% | 6% | 12% | 8% | 8% | 5% | 7% | 3% | 6% | 8% | 3% | 9% |
| 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% | 32% | 35% | 29% | 29% | 41% | 18% | 19% | 20% | 39% | 21% | 26% | 34% | 41% | 42% | 51% | 40% | 19% | 21% | 21% |