 | Do you approve or disapprove of the job Maria Cantwell is doing as United States Senator? |
| TRACK POINTS | 05/10/05 | 06/13/05 | 07/11/05 | 08/15/05 | 09/19/05 | 10/17/05 | 11/14/05 | 12/12/05 | 01/16/06 | 02/13/06 | 03/13/06 | 04/10/06 | 05/15/06 | 06/12/06 | 07/17/06 | 08/14/06 | 09/18/06 | 10/16/06 | 11/12/06 | 12/11/06 | 01/15/07 | 02/12/07 | 03/12/07 | 04/16/07 | 05/14/07 | 06/11/07 | 07/16/07 | 08/13/07 | 09/17/07 | 10/15/07 | 11/12/07 | 12/16/07 | 01/14/08 | 02/05/08 | 03/17/08 | 04/14/08 | 05/19/08 | 08/18/08 | 09/22/08 | 10/20/08 | 11/25/08 | 12/22/08 | 01/22/09 | 02/23/09 | 03/23/09 | 04/27/09 | 05/30/09 | 06/15/09 | 07/20/09 | 08/29/09 | 09/29/09 | 10/30/09 | 11/23/09 | 12/14/09 | 01/11/10 | 02/15/10 | 03/15/10 | 04/12/10 | 05/17/10 | 06/21/10 | 07/19/10 | 08/16/10 |
| ± 7.7% | ± 7.6% | ± 7.5% | ± 7.5% | ± 7.8% | ± 7.5% | ± 7.4% | ± 8% | ± 8% | ± 7.5% | ± 7.6% | ± 7.6% | ± 7.7% | ± 7.8% | ± 8.3% | ± 8.5% | ± 7.8% | ± 7.4% | ± 8.4% | ± 7.8% | ± 7.7% | ± 8.1% | ± 7.8% | ± 8% | ± 8.5% | ± 7.4% | ± 9.3% | ± 8.4% | ± 7.9% | ± 7.7% | ± 7.6% | ± 8.3% | ± 7.7% | ± 7.6% | ± 8.3% | ± 8% | ± 7.8% | ± 7.8% | ± 8.1% | ± 7.8% | ± 8.1% | ± 7.9% | ± 7.5% | ± 7.7% | ± 7.4% | ± 8.2% | ± 7.4% | ± 8.1% | ± 7.3% | ± 7.9% | ± 7.2% | ± 7.9% | ± 7.9% | ± 7.3% | ± 8.3% | ± 8.5% | ± 6.7% | ± 8.2% | ± 8% | ± 7.6% | ± 6.7% | ± 8.2% |
| Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican | Republican |
| Approve | 30% | 34% | 31% | 29% | 35% | 36% | 35% | 39% | 34% | 37% | 36% | 32% | 38% | 34% | 29% | 32% | 27% | 26% | 33% | 29% | 35% | 30% | 28% | 28% | 41% | 27% | 38% | 36% | 38% | 30% | 28% | 38% | 32% | 30% | 32% | 29% | 34% | 28% | 34% | 35% | 40% | 38% | 26% | 29% | 35% | 32% | 29% | 27% | 22% | 28% | 29% | 48% | 34% | 25% | 26% | 26% | 18% | 22% | 32% | 32% | 18% | 26% |
| Disapprove | 55% | 50% | 55% | 60% | 54% | 55% | 55% | 50% | 57% | 51% | 53% | 57% | 55% | 53% | 59% | 62% | 64% | 71% | 63% | 66% | 58% | 65% | 65% | 64% | 55% | 69% | 49% | 56% | 58% | 63% | 65% | 56% | 65% | 63% | 53% | 60% | 58% | 65% | 57% | 54% | 53% | 52% | 62% | 59% | 56% | 58% | 57% | 65% | 73% | 59% | 61% | 42% | 54% | 69% | 66% | 63% | 72% | 66% | 59% | 61% | 76% | 64% |
| Not Sure | 16% | 16% | 14% | 11% | 11% | 8% | 10% | 11% | 9% | 12% | 11% | 12% | 7% | 13% | 11% | 6% | 9% | 4% | 4% | 6% | 7% | 5% | 7% | 8% | 4% | 3% | 13% | 8% | 4% | 6% | 7% | 6% | 3% | 7% | 15% | 10% | 8% | 7% | 9% | 11% | 8% | 10% | 12% | 12% | 10% | 11% | 14% | 7% | 5% | 13% | 10% | 10% | 11% | 6% | 8% | 11% | 9% | 12% | 9% | 7% | 6% | 10% |
| 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% | 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 | 28% | 29% | 29% | 29% | 28% | 29% | 30% | 26% | 26% | 30% | 29% | 29% | 28% | 28% | 26% | 24% | 30% | 29% | 27% | 25% | 29% | 26% | 27% | 26% | 24% | 28% | 21% | 24% | 29% | 28% | 26% | 24% | 26% | 27% | 24% | 25% | 27% | 25% | 25% | 27% | 25% | 27% | 28% | 27% | 30% | 25% | 31% | 23% | 25% | 27% | 31% | 28% | 27% | 27% | 22% | 22% | 30% | 22% | 25% | 28% | 27% | 23% |