| Results of SurveyUSA News Poll #14238 |
 | Do you approve or disapprove of the job Charles Grassley is doing as United States Senator? |
| 600 Adults | All | Gender | 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 | 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 | 68% | 70% | 66% | 69% | ** | ** | ** | 80% | 66% | 66% | 78% | 72% | 61% | 72% | 66% | 57% | 70% | 73% | 65% | 73% | 70% | 55% | 76% | 68% | 69% | 54% | 56% | 79% | 78% | 72% | 73% | 65% | 73% | 60% | 72% | 60% |
| Disapprove | 24% | 27% | 21% | 22% | ** | ** | ** | 11% | 28% | 28% | 19% | 24% | 30% | 21% | 25% | 32% | 23% | 23% | 24% | 22% | 23% | 29% | 18% | 26% | 21% | 37% | 33% | 18% | 21% | 20% | 17% | 27% | 22% | 33% | 24% | 19% |
| Not Sure | 8% | 3% | 13% | 8% | ** | ** | ** | 8% | 7% | 6% | 3% | 4% | 8% | 7% | 9% | 11% | 7% | 4% | 11% | 5% | 7% | 16% | 5% | 6% | 10% | 9% | 11% | 3% | 1% | 8% | 10% | 8% | 5% | 6% | 4% | 21% |
| 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% |
| Composition of Adults | 100% | 48% | 52% | 94% | 2% | 2% | 2% | 26% | 38% | 30% | 27% | 48% | 13% | 46% | 50% | 20% | 70% | 45% | 52% | 46% | 31% | 23% | 25% | 69% | 43% | 7% | 8% | 10% | 7% | 5% | 6% | 7% | 40% | 18% | 23% | 19% |
 | Do you approve or disapprove of the job Tom Harkin is doing as United States Senator? |
| 600 Adults | All | Gender | 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% | Male | Female | 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 | 58% | 60% | 55% | 58% | ** | ** | ** | 34% | 80% | 52% | 33% | 71% | 69% | 46% | 67% | 55% | 57% | 51% | 64% | 53% | 60% | 60% | 44% | 62% | 56% | 75% | 69% | 69% | 34% | 48% | 73% | 21% | 68% | 62% | 51% | 40% |
| Disapprove | 35% | 38% | 33% | 35% | ** | ** | ** | 57% | 17% | 41% | 63% | 26% | 24% | 46% | 26% | 35% | 37% | 45% | 27% | 42% | 35% | 24% | 50% | 32% | 32% | 24% | 22% | 28% | 65% | 49% | 20% | 75% | 27% | 37% | 45% | 38% |
| Not Sure | 7% | 3% | 11% | 8% | ** | ** | ** | 9% | 3% | 7% | 4% | 3% | 7% | 8% | 6% | 10% | 6% | 5% | 8% | 5% | 4% | 16% | 6% | 5% | 11% | 1% | 8% | 3% | 1% | 3% | 7% | 4% | 4% | 2% | 4% | 22% |
| 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% |
| Composition of Adults | 100% | 48% | 52% | 94% | 2% | 2% | 2% | 26% | 38% | 30% | 27% | 48% | 13% | 46% | 50% | 20% | 70% | 45% | 52% | 46% | 31% | 23% | 25% | 69% | 43% | 7% | 8% | 10% | 7% | 5% | 6% | 7% | 40% | 18% | 23% | 19% |