| Results of SurveyUSA News Poll #11622 |
 | 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 | 64% | 61% | 67% | 57% | 68% | 67% | 65% | ** | ** | ** | 84% | 55% | 62% | 84% | 62% | 50% | 71% | 62% | 66% | 63% | 61% | 66% | 66% | 64% | 62% | 65% |
| Disapprove | 27% | 31% | 24% | 25% | 28% | 28% | 27% | ** | ** | ** | 14% | 37% | 28% | 14% | 32% | 36% | 21% | 30% | 26% | 27% | 35% | 24% | 25% | 33% | 25% | 28% |
| Not Sure | 9% | 8% | 9% | 17% | 5% | 5% | 9% | ** | ** | ** | 2% | 8% | 10% | 3% | 6% | 14% | 8% | 8% | 7% | 9% | 5% | 9% | 10% | 3% | 13% | 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% |
| Composition of Adults | 100% | 48% | 52% | 30% | 39% | 31% | 94% | 2% | 2% | 2% | 29% | 36% | 31% | 27% | 46% | 15% | 43% | 53% | 48% | 51% | 23% | 76% | 40% | 20% | 22% | 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% | 51% | 56% | 51% | 51% | 59% | 54% | ** | ** | ** | 35% | 71% | 52% | 28% | 65% | 57% | 38% | 68% | 48% | 59% | 59% | 52% | 55% | 56% | 54% | 46% |
| Disapprove | 37% | 40% | 34% | 31% | 42% | 35% | 37% | ** | ** | ** | 61% | 22% | 36% | 66% | 29% | 27% | 54% | 23% | 45% | 31% | 36% | 38% | 32% | 41% | 34% | 46% |
| Not Sure | 10% | 9% | 10% | 18% | 6% | 6% | 10% | ** | ** | ** | 5% | 7% | 12% | 5% | 6% | 16% | 8% | 9% | 8% | 11% | 5% | 10% | 13% | 3% | 12% | 8% |
| 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% | 39% | 31% | 94% | 2% | 2% | 2% | 29% | 36% | 31% | 27% | 46% | 15% | 43% | 53% | 48% | 51% | 23% | 76% | 40% | 20% | 22% | 18% |