| Results of SurveyUSA News Poll #12481 |
 | 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 | Global Warming | Does The U.S. Ne | Member Of Milita | 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 | Real | Made-up | Needs a | Does Not | Yes | No | Northeas | Southeas | Southwes | Northwes | |
| Approve | 63% | 59% | 66% | 48% | 69% | 69% | 64% | ** | ** | ** | 77% | 60% | 53% | 72% | 61% | 57% | 72% | 56% | 60% | 73% | 55% | 66% | 59% | 65% | 58% | 61% | 69% | 68% |
| Disapprove | 28% | 31% | 26% | 35% | 24% | 27% | 28% | ** | ** | ** | 15% | 32% | 39% | 23% | 30% | 38% | 22% | 35% | 33% | 17% | 36% | 27% | 33% | 27% | 36% | 24% | 26% | 21% |
| Not Sure | 9% | 9% | 8% | 17% | 6% | 4% | 8% | ** | ** | ** | 8% | 8% | 8% | 4% | 10% | 5% | 6% | 9% | 7% | 10% | 9% | 7% | 7% | 8% | 6% | 16% | 5% | 11% |
| 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% |
| Composition of Adults | 100% | 48% | 52% | 30% | 38% | 32% | 94% | 2% | 2% | 2% | 29% | 40% | 28% | 30% | 43% | 17% | 45% | 52% | 69% | 25% | 26% | 72% | 27% | 73% | 39% | 19% | 20% | 22% |
 | 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 | Global Warming | Does The U.S. Ne | Member Of Milita | Region | |||||||||||||||||
| Margin of Sampling Error: ± 4% | Male | Female | 18-34 | 35-54 | 55+ | White | Black | Hispanic | Other | Republic | Democrat | Independ | Conserva | Moderate | Liberal | Pro-life | Pro-choi | Real | Made-up | Needs a | Does Not | Yes | No | Northeas | Southeas | Southwes | Northwes | |
| Approve | 57% | 56% | 57% | 51% | 57% | 62% | 58% | ** | ** | ** | 35% | 75% | 53% | 38% | 63% | 73% | 46% | 67% | 69% | 23% | 54% | 58% | 51% | 59% | 57% | 53% | 53% | 64% |
| Disapprove | 35% | 37% | 32% | 34% | 36% | 33% | 34% | ** | ** | ** | 56% | 19% | 36% | 55% | 29% | 20% | 46% | 26% | 23% | 67% | 36% | 34% | 40% | 33% | 36% | 35% | 41% | 27% |
| Not Sure | 9% | 7% | 10% | 15% | 7% | 5% | 8% | ** | ** | ** | 8% | 6% | 12% | 7% | 8% | 8% | 8% | 8% | 7% | 10% | 10% | 7% | 9% | 8% | 8% | 13% | 6% | 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% |
| Composition of Adults | 100% | 48% | 52% | 30% | 38% | 32% | 94% | 2% | 2% | 2% | 29% | 40% | 28% | 30% | 43% | 17% | 45% | 52% | 69% | 25% | 26% | 72% | 27% | 73% | 39% | 19% | 20% | 22% |