| Results of SurveyUSA News Poll #13718 |
 | 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 | Gun Ownership | Attend Religious Service | Evangelical? | Top Issue For Next President | Region | |||||||||||||||||||||||||||
| Margin of Sampling Error: ± 3.8% | Male | Female | 18-34 | 35-49 | 50-64 | 65+ | White | Black | Hispanic | Other | Republic | Democrat | Independ | Conserva | Moderate | Liberal | Pro-life | Pro-choi | Need | Not Need | Yes | No | Regularl | Occasion | Almost N | Yes | No | Economy | Environm | Health C | Iraq | Terroris | Social S | Educatio | Immigrat | Northeas | Southeas | Southwes | Northwes | |
| Approve | 69% | 69% | 69% | 64% | 67% | 68% | 81% | 70% | ** | ** | ** | 80% | 60% | 69% | 83% | 67% | 60% | 72% | 68% | 60% | 71% | 73% | 66% | 80% | 63% | 55% | 74% | 68% | 68% | 64% | 72% | 66% | 75% | ** | ** | 73% | 64% | 66% | 74% | 75% |
| Disapprove | 24% | 25% | 24% | 26% | 26% | 29% | 15% | 24% | ** | ** | ** | 15% | 36% | 19% | 12% | 26% | 34% | 22% | 26% | 35% | 22% | 21% | 27% | 18% | 27% | 34% | 19% | 26% | 23% | 35% | 23% | 31% | 15% | ** | ** | 23% | 26% | 26% | 22% | 21% |
| Not Sure | 7% | 6% | 7% | 11% | 6% | 4% | 4% | 6% | ** | ** | ** | 4% | 4% | 13% | 5% | 6% | 6% | 6% | 6% | 5% | 7% | 6% | 7% | 3% | 9% | 11% | 8% | 6% | 8% | 2% | 5% | 3% | 10% | ** | ** | 4% | 9% | 7% | 3% | 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% | 100% | 100% | 100% |
| Composition of Adults | 100% | 48% | 52% | 30% | 28% | 22% | 20% | 94% | 2% | 2% | 2% | 31% | 40% | 24% | 29% | 36% | 19% | 44% | 53% | 21% | 69% | 45% | 54% | 46% | 31% | 22% | 28% | 64% | 36% | 5% | 9% | 19% | 9% | 3% | 4% | 11% | 39% | 19% | 22% | 20% |
 | 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 | Gun Ownership | Attend Religious Service | Evangelical? | Top Issue For Next President | Region | |||||||||||||||||||||||||||
| Margin of Sampling Error: ± 4.1% | Male | Female | 18-34 | 35-49 | 50-64 | 65+ | White | Black | Hispanic | Other | Republic | Democrat | Independ | Conserva | Moderate | Liberal | Pro-life | Pro-choi | Need | Not Need | Yes | No | Regularl | Occasion | Almost N | Yes | No | Economy | Environm | Health C | Iraq | Terroris | Social S | Educatio | Immigrat | Northeas | Southeas | Southwes | Northwes | |
| Approve | 55% | 51% | 59% | 56% | 56% | 53% | 56% | 55% | ** | ** | ** | 40% | 74% | 44% | 33% | 62% | 75% | 44% | 65% | 55% | 56% | 50% | 60% | 56% | 56% | 55% | 48% | 59% | 54% | 76% | 63% | 66% | 28% | ** | ** | 50% | 52% | 56% | 60% | 58% |
| Disapprove | 38% | 43% | 33% | 35% | 37% | 43% | 38% | 38% | ** | ** | ** | 55% | 22% | 43% | 64% | 33% | 17% | 50% | 28% | 39% | 37% | 42% | 34% | 39% | 36% | 38% | 43% | 36% | 39% | 23% | 29% | 30% | 67% | ** | ** | 44% | 38% | 39% | 38% | 36% |
| Not Sure | 7% | 5% | 8% | 9% | 7% | 4% | 6% | 7% | ** | ** | ** | 4% | 4% | 13% | 3% | 5% | 8% | 6% | 6% | 6% | 7% | 8% | 6% | 5% | 9% | 7% | 9% | 5% | 7% | 2% | 7% | 4% | 5% | ** | ** | 6% | 11% | 5% | 2% | 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% | 100% | 100% | 100% |
| Composition of Adults | 100% | 48% | 52% | 30% | 28% | 22% | 20% | 94% | 2% | 2% | 2% | 31% | 40% | 24% | 29% | 36% | 19% | 44% | 53% | 21% | 69% | 45% | 54% | 46% | 31% | 22% | 28% | 64% | 36% | 5% | 9% | 19% | 9% | 3% | 4% | 11% | 39% | 19% | 22% | 20% |