| Results of SurveyUSA News Poll #12235 |
 | 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 | Does The U.S. Need a Dra | 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 | Needs a | Does Not | Not Sure | Northeas | Southeas | Southwes | Northwes | |
| Approve | 64% | 62% | 66% | 60% | 62% | 71% | 65% | ** | ** | ** | 77% | 54% | 62% | 76% | 68% | 48% | 75% | 57% | 65% | 63% | 64% | 64% | 61% | 71% | 53% | 69% | 58% | 66% | ** | 62% | 65% | 66% | 66% |
| Disapprove | 28% | 30% | 25% | 29% | 29% | 25% | 27% | ** | ** | ** | 17% | 38% | 30% | 17% | 26% | 42% | 18% | 37% | 28% | 29% | 31% | 28% | 32% | 22% | 39% | 24% | 37% | 26% | ** | 29% | 31% | 25% | 25% |
| Not Sure | 8% | 8% | 9% | 11% | 9% | 5% | 8% | ** | ** | ** | 6% | 9% | 9% | 7% | 5% | 10% | 7% | 6% | 7% | 8% | 5% | 8% | 7% | 7% | 7% | 6% | 5% | 8% | ** | 9% | 4% | 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% |
| Composition of Adults | 100% | 48% | 52% | 30% | 38% | 32% | 94% | 2% | 2% | 2% | 33% | 34% | 31% | 28% | 44% | 18% | 44% | 52% | 48% | 50% | 21% | 78% | 67% | 27% | 35% | 56% | 25% | 72% | 3% | 41% | 20% | 21% | 19% |
 | 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 | Does The U.S. Need a Dra | 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 | Needs a | Does Not | Not Sure | Northeas | Southeas | Southwes | Northwes | |
| Approve | 51% | 52% | 51% | 57% | 45% | 53% | 52% | ** | ** | ** | 34% | 68% | 50% | 34% | 61% | 62% | 35% | 66% | 53% | 50% | 57% | 50% | 63% | 31% | 64% | 41% | 56% | 50% | ** | 50% | 54% | 54% | 49% |
| Disapprove | 38% | 40% | 36% | 28% | 45% | 38% | 37% | ** | ** | ** | 59% | 22% | 35% | 58% | 34% | 24% | 56% | 26% | 40% | 38% | 38% | 39% | 28% | 60% | 26% | 50% | 37% | 40% | ** | 39% | 38% | 33% | 39% |
| Not Sure | 11% | 8% | 13% | 15% | 10% | 8% | 11% | ** | ** | ** | 7% | 9% | 14% | 8% | 5% | 14% | 9% | 8% | 8% | 12% | 5% | 11% | 9% | 10% | 10% | 9% | 6% | 10% | ** | 11% | 8% | 13% | 12% |
| 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% |
| Composition of Adults | 100% | 48% | 52% | 30% | 38% | 32% | 94% | 2% | 2% | 2% | 33% | 34% | 31% | 28% | 44% | 18% | 44% | 52% | 48% | 50% | 21% | 78% | 67% | 27% | 35% | 56% | 25% | 72% | 3% | 41% | 20% | 21% | 19% |