| Results of SurveyUSA News Poll #15407 |
 | 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: ± 3.9% | 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 | 63% | 63% | 62% | 52% | 65% | 64% | 73% | 65% | ** | ** | ** | 64% | 61% | 57% | 60% | ** | 67% | 75% | ** | 32% | 61% | 82% | 60% | 56% | 72% | 75% | 56% | 63% | 77% | 57% | 59% | 63% | 64% | 53% | 65% | 65% | 81% |
| Disapprove | 27% | 30% | 23% | 25% | 27% | 30% | 25% | 26% | ** | ** | ** | 25% | 28% | 38% | 27% | ** | 21% | 24% | ** | 46% | 30% | 12% | 14% | 28% | 26% | 16% | 38% | 20% | 17% | 33% | 25% | 28% | 24% | 31% | 23% | 31% | 15% |
| Not Sure | 10% | 7% | 14% | 23% | 8% | 6% | 2% | 10% | ** | ** | ** | 11% | 11% | 5% | 13% | ** | 12% | 1% | ** | 23% | 9% | 6% | 26% | 17% | 2% | 9% | 6% | 18% | 7% | 10% | 16% | 9% | 12% | 16% | 12% | 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% | 29% | 21% | 20% | 94% | 2% | 2% | 2% | 77% | 14% | 12% | 68% | 1% | 7% | 7% | 5% | 10% | 41% | 14% | 8% | 6% | 21% | 28% | 40% | 29% | 26% | 44% | 22% | 52% | 48% | 41% | 21% | 21% | 18% |
 | 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% | 57% | 51% | 52% | 50% | 57% | 58% | 55% | ** | ** | ** | 53% | 59% | 45% | 49% | ** | 74% | 64% | ** | 28% | 53% | 68% | 55% | 65% | 55% | 28% | 76% | 48% | 28% | 59% | 69% | 55% | 52% | 49% | 54% | 57% | 61% |
| Disapprove | 35% | 33% | 36% | 26% | 36% | 40% | 40% | 35% | ** | ** | ** | 36% | 22% | 51% | 36% | ** | 18% | 33% | ** | 34% | 38% | 24% | 27% | 18% | 43% | 59% | 19% | 33% | 65% | 34% | 11% | 35% | 35% | 34% | 37% | 34% | 35% |
| Not Sure | 12% | 11% | 12% | 22% | 14% | 3% | 2% | 10% | ** | ** | ** | 11% | 19% | 4% | 15% | ** | 7% | 3% | ** | 38% | 9% | 8% | 18% | 17% | 2% | 12% | 5% | 19% | 7% | 8% | 21% | 10% | 13% | 17% | 9% | 9% | 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% | 29% | 21% | 20% | 94% | 2% | 2% | 2% | 77% | 14% | 12% | 68% | 1% | 7% | 7% | 5% | 10% | 41% | 14% | 8% | 6% | 21% | 28% | 40% | 29% | 26% | 44% | 22% | 52% | 48% | 41% | 21% | 21% | 18% |