| Results of SurveyUSA News Poll #13104 |
 | 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 | Does US Need a D | Attend Religious Service | Evangelical? | Top Issue For Next President | 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 | Need | Not Need | Regularl | Occasion | Almost N | Yes | No | Economy | Environm | Health C | Iraq | Terroris | Social S | Educatio | Immigrat | Northeas | Southeas | Southwes | Northwes | |
| Approve | 66% | 68% | 64% | 64% | 60% | 75% | 67% | ** | ** | ** | 71% | 60% | 71% | 74% | 66% | 63% | 70% | 63% | 68% | 68% | 71% | 61% | 59% | 68% | 65% | 68% | 44% | 63% | 61% | 78% | 59% | ** | 74% | 67% | 69% | 64% | 61% |
| Disapprove | 26% | 27% | 25% | 25% | 32% | 19% | 25% | ** | ** | ** | 23% | 32% | 22% | 18% | 28% | 28% | 22% | 29% | 26% | 25% | 21% | 31% | 30% | 24% | 27% | 27% | 43% | 28% | 32% | 17% | 24% | ** | 20% | 24% | 25% | 27% | 30% |
| Not Sure | 8% | 5% | 11% | 11% | 9% | 6% | 8% | ** | ** | ** | 7% | 8% | 8% | 8% | 6% | 9% | 9% | 8% | 6% | 7% | 7% | 8% | 11% | 8% | 8% | 6% | 13% | 9% | 7% | 5% | 17% | ** | 6% | 9% | 7% | 9% | 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% | 100% | 100% | 100% | 100% | 100% | 100% | 100% | 100% |
| Composition of Adults | 100% | 48% | 52% | 30% | 38% | 32% | 94% | 2% | 2% | 2% | 36% | 35% | 26% | 30% | 42% | 16% | 47% | 49% | 17% | 73% | 53% | 24% | 24% | 31% | 63% | 17% | 5% | 17% | 19% | 10% | 5% | 3% | 16% | 43% | 19% | 21% | 17% |
 | 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 | Does US Need a D | Attend Religious Service | Evangelical? | Top Issue For Next President | 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 | Need | Not Need | Regularl | Occasion | Almost N | Yes | No | Economy | Environm | Health C | Iraq | Terroris | Social S | Educatio | Immigrat | Northeas | Southeas | Southwes | Northwes | |
| Approve | 54% | 54% | 54% | 56% | 51% | 56% | 54% | ** | ** | ** | 32% | 74% | 58% | 21% | 71% | 65% | 36% | 71% | 53% | 55% | 45% | 67% | 61% | 42% | 59% | 58% | 82% | 70% | 78% | 22% | 42% | ** | 17% | 51% | 60% | 60% | 46% |
| Disapprove | 38% | 40% | 36% | 33% | 41% | 40% | 38% | ** | ** | ** | 63% | 19% | 30% | 70% | 24% | 26% | 55% | 22% | 41% | 38% | 47% | 26% | 30% | 49% | 34% | 36% | 9% | 20% | 17% | 74% | 45% | ** | 77% | 39% | 34% | 33% | 48% |
| Not Sure | 8% | 6% | 10% | 12% | 8% | 5% | 8% | ** | ** | ** | 5% | 7% | 12% | 9% | 5% | 9% | 9% | 6% | 6% | 7% | 8% | 7% | 9% | 9% | 7% | 6% | 8% | 10% | 5% | 4% | 13% | ** | 6% | 10% | 5% | 8% | 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% | 30% | 38% | 32% | 94% | 2% | 2% | 2% | 36% | 35% | 26% | 30% | 42% | 16% | 47% | 49% | 17% | 73% | 53% | 24% | 24% | 31% | 63% | 17% | 5% | 17% | 19% | 10% | 5% | 3% | 16% | 43% | 19% | 21% | 17% |