2008 Illinois Democratic Presidential Primary
| Pollster | Dates | N/Pop | Clinton | Edwards | Obama | Undecided |
| SurveyUSA | 2/2-3/08 | 1010 LV | 30 | - | 66 | 1 |
| Tribune/WGN | 1/30-31/08 | 500 LV | 24 | - | 55 | 20 |
| ARG | 1/30-31/08 | 600 LV | 40 | - | 51 | 8 |
| Rasmussen | 1/29/2008 | 631 LV | 24 | - | 60 | 2 |
| Post-Dispatch/ Research 2000 | 1/21-24/08 | 500 LV | 22 | 15 | 51 | 10 |
| Tribune/WGN | 12/9-13/07 | 500 LV | 25 | 7 | 50 | 11 |
| ARG | 7/6-9/07 | 600 LV | 33 | 10 | 37 | 12 |
| ARG | 1/11-14/07 | 600 LV | 30 | 5 | 36 | 16 |
