| Results of SurveyUSA News Poll #11768 |
 | 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 | Gun Ownership | Labor Union | Global Warming | Support Same Sex | 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 | Yes | No | Yes | No | Real | Made-up | Support | Oppose | Northeas | Southeas | Southwes | Northwes | |
| Approve | 64% | 63% | 65% | 60% | 62% | 71% | 66% | ** | ** | ** | 80% | 54% | 65% | 83% | 61% | 53% | 77% | 58% | 69% | 62% | 57% | 68% | 59% | 83% | 53% | 74% | 69% | 60% | 56% | 67% |
| Disapprove | 28% | 31% | 26% | 31% | 29% | 24% | 27% | ** | ** | ** | 17% | 38% | 29% | 17% | 32% | 41% | 19% | 33% | 25% | 29% | 36% | 25% | 32% | 13% | 38% | 21% | 25% | 30% | 36% | 25% |
| Not Sure | 7% | 6% | 8% | 9% | 9% | 4% | 7% | ** | ** | ** | 3% | 9% | 6% | 1% | 7% | 6% | 5% | 10% | 6% | 9% | 7% | 8% | 9% | 5% | 10% | 5% | 6% | 10% | 8% | 8% |
| 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% |
| Composition of Adults | 100% | 48% | 52% | 30% | 38% | 31% | 94% | 2% | 2% | 2% | 32% | 33% | 27% | 29% | 45% | 15% | 44% | 50% | 48% | 52% | 20% | 79% | 71% | 19% | 31% | 61% | 40% | 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 | Gun Ownership | Labor Union | Global Warming | Support Same Sex | 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 | Yes | No | Yes | No | Real | Made-up | Support | Oppose | Northeas | Southeas | Southwes | Northwes | |
| Approve | 51% | 50% | 52% | 52% | 49% | 54% | 52% | ** | ** | ** | 31% | 72% | 50% | 27% | 62% | 65% | 41% | 59% | 45% | 56% | 57% | 49% | 60% | 29% | 60% | 43% | 50% | 49% | 59% | 47% |
| Disapprove | 41% | 45% | 37% | 38% | 43% | 41% | 40% | ** | ** | ** | 65% | 21% | 42% | 70% | 32% | 28% | 53% | 31% | 48% | 35% | 32% | 44% | 32% | 67% | 30% | 50% | 42% | 39% | 36% | 47% |
| Not Sure | 8% | 5% | 10% | 10% | 8% | 5% | 8% | ** | ** | ** | 4% | 6% | 8% | 2% | 5% | 7% | 6% | 9% | 7% | 9% | 11% | 7% | 9% | 4% | 9% | 7% | 8% | 12% | 5% | 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% |
| Composition of Adults | 100% | 48% | 52% | 30% | 38% | 31% | 94% | 2% | 2% | 2% | 32% | 33% | 27% | 29% | 45% | 15% | 44% | 50% | 48% | 52% | 20% | 79% | 71% | 19% | 31% | 61% | 40% | 19% | 22% | 20% |