| Results of SurveyUSA Election Poll #12014 |
 | 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 | ||||||||||||||||||||
| Credibility Interval: ± 3.8 pct points | 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 | 68% | 69% | 68% | 69% | 64% | 73% | 69% | ** | ** | ** | 84% | 60% | 69% | 84% | 68% | 58% | 81% | 64% | 75% | 66% | 63% | 72% | 65% | 83% | 63% | 76% | 70% | 71% | 61% | 67% | 66% | 69% | 73% |
| Disapprove | 26% | 27% | 25% | 24% | 30% | 23% | 25% | ** | ** | ** | 9% | 34% | 28% | 13% | 28% | 35% | 15% | 31% | 21% | 28% | 34% | 22% | 30% | 13% | 32% | 20% | 27% | 24% | 34% | 28% | 27% | 27% | 21% |
| Not Sure | 5% | 4% | 7% | 7% | 5% | 4% | 6% | ** | ** | ** | 7% | 6% | 3% | 3% | 3% | 7% | 4% | 5% | 5% | 5% | 2% | 6% | 5% | 4% | 4% | 4% | 3% | 6% | 5% | 5% | 7% | 3% | 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% |
| Composition of Adults | 100% | 48% | 52% | 30% | 38% | 32% | 94% | 2% | 2% | 2% | 29% | 37% | 32% | 28% | 45% | 18% | 37% | 55% | 47% | 51% | 23% | 76% | 69% | 22% | 33% | 57% | 26% | 67% | 7% | 41% | 19% | 21% | 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 | Does The U.S. Need a Dra | Region | ||||||||||||||||||||
| Credibility Interval: ± 4 pct points | 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 | 57% | 53% | 62% | 57% | 59% | 56% | 58% | ** | ** | ** | 38% | 78% | 56% | 36% | 66% | 77% | 41% | 71% | 53% | 65% | 62% | 58% | 70% | 28% | 76% | 48% | 58% | 58% | 70% | 51% | 68% | 64% | 54% |
| Disapprove | 38% | 45% | 32% | 40% | 36% | 40% | 37% | ** | ** | ** | 57% | 18% | 41% | 62% | 31% | 17% | 54% | 26% | 43% | 31% | 36% | 37% | 26% | 68% | 21% | 48% | 39% | 37% | 24% | 44% | 30% | 33% | 40% |
| Not Sure | 5% | 2% | 6% | 4% | 6% | 4% | 5% | ** | ** | ** | 5% | 4% | 4% | 2% | 3% | 5% | 5% | 3% | 4% | 4% | 2% | 5% | 4% | 4% | 3% | 4% | 3% | 5% | 6% | 6% | 2% | 3% | 7% |
| 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% | 29% | 37% | 32% | 28% | 45% | 18% | 37% | 55% | 47% | 51% | 23% | 76% | 69% | 22% | 33% | 57% | 26% | 67% | 7% | 41% | 19% | 21% | 20% |