| Results of SurveyUSA News Poll #15289 |
 | 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: ± 4% | 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 | 59% | 58% | 61% | 47% | 57% | 65% | 76% | 59% | ** | ** | ** | 63% | 49% | 55% | 60% | ** | 58% | 82% | ** | 40% | 60% | 66% | 67% | 47% | 73% | 69% | 57% | 55% | 68% | 66% | 41% | 56% | 62% | 64% | 55% | 64% | 51% |
| Disapprove | 32% | 32% | 32% | 40% | 35% | 30% | 19% | 32% | ** | ** | ** | 29% | 37% | 22% | 34% | ** | 33% | 11% | ** | 31% | 34% | 30% | 22% | 46% | 21% | 25% | 36% | 31% | 27% | 27% | 49% | 33% | 31% | 28% | 32% | 29% | 42% |
| Not Sure | 9% | 11% | 7% | 14% | 9% | 5% | 5% | 9% | ** | ** | ** | 8% | 14% | 23% | 6% | ** | 8% | 6% | ** | 29% | 6% | 4% | 11% | 8% | 6% | 6% | 7% | 13% | 5% | 7% | 10% | 11% | 6% | 8% | 13% | 7% | 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% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% |
| Composition of Adults | 100% | 48% | 52% | 31% | 27% | 22% | 20% | 94% | 2% | 2% | 2% | 73% | 20% | 16% | 60% | 2% | 8% | 9% | 3% | 10% | 46% | 10% | 12% | 8% | 14% | 31% | 39% | 25% | 33% | 37% | 19% | 48% | 52% | 39% | 21% | 19% | 21% |
 | 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 | 51% | 48% | 53% | 48% | 50% | 49% | 57% | 50% | ** | ** | ** | 50% | 59% | 45% | 53% | ** | 46% | 52% | ** | 39% | 49% | 62% | 54% | 45% | 58% | 27% | 79% | 48% | 28% | 66% | 75% | 51% | 53% | 62% | 41% | 46% | 42% |
| Disapprove | 38% | 38% | 38% | 30% | 42% | 46% | 36% | 38% | ** | ** | ** | 42% | 25% | 32% | 41% | ** | 46% | 37% | ** | 33% | 45% | 34% | 36% | 29% | 34% | 65% | 15% | 40% | 65% | 27% | 15% | 36% | 39% | 28% | 48% | 47% | 38% |
| Not Sure | 11% | 13% | 10% | 21% | 8% | 5% | 8% | 12% | ** | ** | ** | 8% | 16% | 22% | 5% | ** | 9% | 12% | ** | 29% | 6% | 3% | 11% | 26% | 8% | 8% | 6% | 12% | 7% | 7% | 10% | 14% | 8% | 10% | 10% | 7% | 20% |
| 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% | 31% | 27% | 22% | 20% | 94% | 2% | 2% | 2% | 73% | 20% | 16% | 60% | 2% | 8% | 9% | 3% | 10% | 46% | 10% | 12% | 8% | 14% | 31% | 39% | 25% | 33% | 37% | 19% | 48% | 52% | 39% | 21% | 19% | 21% |