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Primary Date: May 20 | Delegates at Stake: 51
| Poll | Date | Sample | Clinton | Obama | Spread |
|---|---|---|---|---|---|
| Research 2000 | 05/07 - 05/09 | 500 LV | 58 | 31 | Clinton +27.0 |
| Rasmussen | 05/05 - 05/05 | 800 LV | 56 | 31 | Clinton +25.0 |
| SurveyUSA | 05/03 - 05/05 | 595 LV | 62 | 28 | Clinton +34.0 |
Primary Date: May 20 | Delegates at Stake: 52
| Poll | Date | Sample | Obama | Clinton | Spread |
|---|---|---|---|---|---|
| Portland Tribune | 05/08 - 05/10 | 400 LV | 55 | 35 | Obama +20.0 |
| PPP (D) | 05/10 - 05/11 | 949 LV | 53 | 39 | Obama +14.0 |
| SurveyUSA | 05/09 - 05/11 | 615 LV | 54 | 43 | Obama +11.0 |
| Rasmussen | 05/01 - 05/01 | 867 LV | 51 | 39 | Obama +12.0 |