Poll Data For Washington (11 Electoral Votes)
Obama : 54.8% McCain: 39.6% - Strong Obama
| Poll | Dates | Obama % | McCain % | Poll Age | Poll Weight | |||||
| Strategic Vision | 800 | LV | 3.0% | 10/31 | - | 11/2 | 55 | 40 | 0 | 1 |
| Survey USA | 663 | LV | 3.9% | 10/30 | - | 11/2 | 56 | 40 | 0 | 1 |
| Survey USA | 630 | LV | 4.0% | 10/26 | - | 10/27 | 56 | 39 | 6 | 0.735 |
| Strategic Vision | 800 | LV | 3.0% | 10/25 | - | 10/26 | 54 | 42 | 7 | 0.671 |
| Washington Poll | 600 | LV | 4.0% | 10/18 | - | 10/26 | 55 | 34 | 7 | 0.671 |
| Rasmussen | 500 | LV | 4.5% | 10/22 | 54 | 43 | 11 | 0.452 | ||
| Elway | 405 | 5.0% | 10/16 | - | 10/19 | 55 | 36 | 14 | 0.338 | |
| Survey USA | 544 | LV | 4.3% | 10/12 | - | 10/13 | 56 | 40 | 20 | 0.2 |
| Rasmussen | 700 | LV | 4.0% | 10/2 | 53 | 43 | 31 | 0.094 | ||
| Survey USA | 682 | LV | 3.8% | 9/21 | - | 9/22 | 54 | 43 | 41 | 0.056 |
| ARG | 600 | LV | 4.0% | 9/16 | - | 9/18 | 50 | 44 | 45 | 0.047 |
| Strategic Vision | 800 | LV | 3.0% | 9/14 | - | 9/16 | 47 | 42 | 47 | 0.043 |
| Rasmussen | 500 | LV | 4.5% | 9/10 | 49 | 47 | 53 | 0.034 | ||
| Survey USA | 658 | LV | 3.9% | 9/5 | - | 9/7 | 49 | 45 | 56 | 0.031 |
| Survey USA | 718 | LV | 3.7% | 8/11 | - | 8/12 | 51 | 44 | 82 | 0.015 |
| Rasmussen | 500 | LV | 4.5% | 8/6 | 54 | 42 | 88 | 0.013 | ||
| Elway | 405 | RV | 5.0% | 7/22 | - | 7/31 | 47 | 35 | 94 | 0.011 |
| Strategic Vision | 800 | LV | 3.0% | 7/25 | - | 7/27 | 48 | 37 | 98 | 0.01 |
| Survey USA | 666 | LV | 3.9% | 7/13 | - | 7/15 | 55 | 39 | 110 | 0.008 |
| Moore Information | 400 | LV | 5.0% | 7/9 | - | 7/10 | 47 | 37 | 115 | 0.008 |
| Rasmussen | 500 | LV | 4.5% | 7/9 | 51 | 43 | 116 | 0.007 | ||
| Strategies 360 | 1200 | RV | 2.8% | 6/26 | 47 | 39 | 129 | 0.006 | ||
| Survey USA | 532 | LV | 4.3% | 6/17 | - | 6/19 | 55 | 40 | 136 | 0.005 |
| Rasmussen | 500 | LV | 4.5% | 6/9 | 53 | 35 | 146 | 0.005 | ||
| Survey USA | 637 | RV | 4.0% | 6/7 | - | 6/9 | 56 | 39 | 146 | 0.005 |
| Elway | 405 | RV | 5.0% | 5/21 | - | 5/25 | 44 | 38 | 161 | 0.004 |
| Survey USA | 634 | RV | 4.0% | 4/14 | - | 4/16 | 53 | 40 | 200 | 0.002 |
| Survey USA | 607 | RV | 4.1% | 4/7 | 51 | 44 | 209 | 0.002 | ||
| Rasmussen | 500 | LV | 4.5% | 3/27 | 48 | 43 | 220 | 0.002 | ||
| Elway | 405 | RV | 5.0% | 3/18 | - | 3/20 | 45 | 39 | 227 | 0.002 |
| Survey USA | 510 | RV | 4.5% | 3/14 | - | 3/16 | 52 | 41 | 231 | 0.002 |
| Rasmussen | 500 | LV | 4.5% | 2/28 | 4 | 45 | 248 | 0.002 | ||
| Survey USA | 534 | RV | 4.4% | 2/3 | - | 2/4 | 55 | 38 | 272 | 0.001 |
| Survey USA | 527 | RV | 4.4% | 1/11 | - | 1/13 | 52 | 43 | 294 | 0.001 |
