| Results of SurveyUSA News Poll #15221 |
 | Do you approve or disapprove of the job Charles Grassley is doing as United States Senator? |
| 600 Adults | All | Gender | Age | Race | Home Ownership | Marital Status | Job Status | Party Affiliation | Ideology | Income | Region | ||||||||||||||||||||||||||
| Margin of Sampling Error: ± 3.8% | Male | Female | 18-34 | 35-49 | 50-64 | 65+ | White | Black | Hispanic | Other | Own | Rent | Single | Married | Separate | Divorced | Widowed | Un-marri | Student | Full-tim | Part-tim | Homemake | Unemploy | Retired | Republic | Democrat | Independ | Conserva | Moderate | Liberal | < $50K | > $50K | Northeas | Southeas | Southwes | Northwes | |
| Approve | 68% | 69% | 66% | 58% | 72% | 67% | 77% | 68% | ** | ** | ** | 67% | 61% | 78% | 66% | ** | 70% | 62% | ** | 82% | 65% | 74% | 60% | 58% | 75% | 77% | 63% | 62% | 74% | 70% | 47% | 65% | 70% | 70% | 68% | 62% | 70% |
| Disapprove | 27% | 27% | 26% | 33% | 22% | 31% | 19% | 26% | ** | ** | ** | 26% | 34% | 20% | 27% | ** | 24% | 37% | ** | 18% | 30% | 15% | 28% | 38% | 21% | 20% | 31% | 31% | 24% | 25% | 44% | 27% | 26% | 24% | 24% | 34% | 26% |
| Not Sure | 6% | 4% | 8% | 10% | 6% | 2% | 4% | 6% | ** | ** | ** | 6% | 5% | 2% | 7% | ** | 6% | 1% | ** | 0% | 6% | 11% | 12% | 4% | 4% | 3% | 6% | 8% | 2% | 5% | 10% | 7% | 4% | 6% | 8% | 4% | 4% |
| 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% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% |
| Composition of Adults | 100% | 48% | 52% | 29% | 27% | 24% | 20% | 94% | 2% | 2% | 2% | 74% | 19% | 17% | 64% | 1% | 8% | 8% | 2% | 9% | 48% | 8% | 9% | 9% | 18% | 33% | 37% | 26% | 37% | 40% | 13% | 50% | 50% | 39% | 18% | 24% | 20% |
 | Do you approve or disapprove of the job Tom Harkin is doing as United States Senator? |
| 600 Adults | All | Gender | Age | Race | Home Ownership | Marital Status | Job Status | Party Affiliation | Ideology | Income | Region | ||||||||||||||||||||||||||
| Margin of Sampling Error: ± 4.1% | Male | Female | 18-34 | 35-49 | 50-64 | 65+ | White | Black | Hispanic | Other | Own | Rent | Single | Married | Separate | Divorced | Widowed | Un-marri | Student | Full-tim | Part-tim | Homemake | Unemploy | Retired | Republic | Democrat | Independ | Conserva | Moderate | Liberal | < $50K | > $50K | Northeas | Southeas | Southwes | Northwes | |
| Approve | 54% | 51% | 57% | 48% | 54% | 60% | 56% | 54% | ** | ** | ** | 56% | 53% | 56% | 50% | ** | 66% | 72% | ** | 47% | 58% | 41% | 36% | 66% | 59% | 26% | 82% | 52% | 30% | 70% | 75% | 58% | 51% | 58% | 58% | 59% | 39% |
| Disapprove | 39% | 43% | 36% | 44% | 40% | 35% | 38% | 39% | ** | ** | ** | 37% | 42% | 41% | 43% | ** | 24% | 20% | ** | 53% | 36% | 47% | 51% | 31% | 35% | 70% | 10% | 42% | 67% | 25% | 15% | 33% | 46% | 35% | 33% | 38% | 55% |
| Not Sure | 6% | 5% | 8% | 8% | 6% | 5% | 6% | 7% | ** | ** | ** | 7% | 5% | 3% | 7% | ** | 10% | 8% | ** | 0% | 6% | 12% | 14% | 3% | 6% | 4% | 8% | 6% | 3% | 5% | 9% | 9% | 3% | 7% | 9% | 4% | 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% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% |
| Composition of Adults | 100% | 48% | 52% | 29% | 27% | 24% | 20% | 94% | 2% | 2% | 2% | 74% | 19% | 17% | 64% | 1% | 8% | 8% | 2% | 9% | 48% | 8% | 9% | 9% | 18% | 33% | 37% | 26% | 37% | 40% | 13% | 50% | 50% | 39% | 18% | 24% | 20% |