Poll Data For California (55 Electoral Votes)
Obama : 57.5% McCain: 35.2% - Strong Obama
| Poll | Dates | Obama % | McCain % | Poll Age | Poll Weight | |||||
| Survey USA | 637 | LV | 3.9% | 10/29 | - | 10/31 | 60 | 36 | 0 | 1 |
| Field | 966 | LV | 3.3% | 10/18 | - | 10/28 | 55 | 33 | 3 | 0.917 |
| Rasmussen | 500 | LV | 4.5% | 10/25 | 61 | 34 | 6 | 0.735 | ||
| PPIC | 1186 | LV | 3.0% | 10/12 | - | 10/19 | 56 | 33 | 12 | 0.41 |
| Survey USA | 615 | LV | 4.0% | 10/15 | - | 10/16 | 59 | 35 | 15 | 0.308 |
| Rasmussen | 500 | LV | 4.5% | 10/9 | 56 | 40 | 22 | 0.171 | ||
| Survey USA | 670 | 3.8% | 10/4 | - | 10/5 | 55 | 39 | 26 | 0.129 | |
| Survey USA | 661 | LV | 3.9% | 9/23 | - | 9/24 | 53 | 43 | 37 | 0.068 |
| Rasmussen | 500 | LV | 4.5% | 9/22 | 56 | 39 | 39 | 0.062 | ||
| ARG | 600 | LV | 4.0% | 9/18 | - | 9/20 | 53 | 39 | 41 | 0.056 |
| PPIC | 1157 | LV | 3.0% | 9/9 | - | 9/16 | 50 | 40 | 45 | 0.047 |
| Field | 830 | LV | 3.5% | 9/5 | - | 9/14 | 52 | 36 | 47 | 0.043 |
| Rasmussen | 500 | LV | 4.5% | 8/20 | 54 | 41 | 72 | 0.019 | ||
| PPIC | 1047 | LV | 3.0% | 8/12 | - | 8/19 | 48 | 39 | 73 | 0.018 |
| Rasmussen | 500 | LV | 4.5% | 7/24 | 52 | 42 | 99 | 0.01 | ||
| PPIC | 1401 | LV | 3.0% | 7/8 | - | 7/22 | 50 | 35 | 101 | 0.01 |
| Field | 672 | LV | 3.9% | 7/8 | - | 7/14 | 54 | 30 | 109 | 0.008 |
| Survey USA | 503 | RV | 4.5% | 6/19 | - | 6/29 | 53 | 41 | 124 | 0.006 |
| Rasmussen | 500 | LV | 4.5% | 6/23 | 58 | 30 | 130 | 0.006 | ||
| Field | 914 | LV | 3.4% | 5/16 | - | 5/27 | 52 | 35 | 157 | 0.004 |
| Times/Bloomberg | 705 | RV | 4.0% | 5/20 | - | 5/21 | 47 | 40 | 163 | 0.004 |
| Rasmussen | 500 | LV | 4.5% | 5/19 | - | 5/20 | 52 | 38 | 164 | 0.004 |
| Survey USA | 600 | RV | 4.1% | 5/16 | - | 5/18 | 49 | 41 | 166 | 0.004 |
| PPIC | 1086 | LV | 3.0% | 5/12 | - | 5/16 | 54 | 37 | 168 | 0.004 |
| Rasmussen | 500 | LV | 4.5% | 4/16 | 50 | 43 | 198 | 0.003 | ||
| Survey USA | 503 | RV | 4.5% | 4/11 | - | 4/13 | 50 | 43 | 201 | 0.002 |
| PPIC | 1077 | LV | 3.0% | 3/11 | - | 3/18 | 49 | 40 | 227 | 0.002 |
| Survey USA | 489 | RV | 4.5% | 3/14 | - | 3/16 | 54 | 40 | 229 | 0.002 |
| Rasmussen | 500 | LV | 4.5% | 3/15 | 53 | 38 | 230 | 0.002 | ||
| Survey USA | 593 | RV | 4.1% | 2/26 | - | 2/28 | 51 | 40 | 246 | 0.002 |
| Survey USA | 512 | RV | 4.3% | 2/15 | - | 2/17 | 61 | 34 | 257 | 0.002 |
| Field | 569 | LV | 4.2% | 1/25 | - | 2/1 | 47 | 40 | 273 | 0.001 |
| Survey USA | 519 | RV | 4.4% | 1/20 | - | 1/21 | 50 | 44 | 284 | 0.001 |
