2008 Iowa Democratic Presidential Caucus
What are these numbers? Click here for details.
The chart below plots the standard estimate for each candidate; a chart further down the page plots the three trends of varying intensity.
(Alternate Chart: All data since 2004)
| Pollster | Dates | N/Pop | Biden | Clinton | Edwards | Obama | Richardson |
| ARG | 12/31/07-1/2/08 | 600 LV | 8 | 34 | 21 | 25 | 6 |
| Reuters/CSPAN/ Zogby | 12/30/07-1/2/08 | 905 LV | 5 | 24 | 27 | 31 | 7 |
| Reuters/CSPAN/ Zogby* | 12/29/07-1/1/08 | 933 LV | 4 | 28 | 26 | 28 | 7 |
| Reuters/CSPAN/ Zogby* | 12/28-31/07 | 925 LV | 5 | 30 | 25 | 26 | 5 |
| Strategic Vision (R) | 12/28-30/07 | 600 LV | 5 | 27 | 29 | 32 | 2 |
| Register/Selzer | 12/27-30/07 | 800 LV | 4 | 25 | 24 | 32 | 6 |
| Reuters/CSPAN/ Zogby* | 12/27-30/07 | 899 LV | 5 | 30 | 26 | 26 | 5 |
| CNN | 12/26-30/07 | 482 LV | 4 | 33 | 22 | 31 | 7 |
| InsiderAdvantage | 12/28-29/07 | 788 LV | - | 30 | 29 | 22 | - |
| Reuters/CSPAN/ Zogby | 12/26-29/07 | 934 LV | 5 | 31 | 24 | 27 | 5 |
| McClatchy/MSNBC/ Mason-Dixon | 12/26-28/07 | 400 LV | 8 | 23 | 24 | 22 | 12 |
| ARG | 12/26-28/07 | 600 LV | 5 | 31 | 24 | 24 | 5 |
| Research 2000 | 12/26-27/07 | 500 LV | 3 | 28 | 29 | 29 | 7 |
| Strategic Vision (R) | 12/26-27/07 | 600 LV | 5 | 29 | 28 | 30 | 2 |
| Times/Blooomberg | 12/20-26/07 | 580 CV | 4 | 29 | 25 | 26 | 6 |
| ARG | 12/20-23/07 | 600 LV | 8 | 34 | 20 | 19 | 5 |
| ARG | 12/16-19/07 | 600 LV | 8 | 29 | 18 | 25 | 7 |
| Strategic Vision (R) | 12/16-18/07 | 600 LV | 5 | 27 | 27 | 30 | 3 |
| CNN | 12/14-18/07 | 543 LV | 3 | 30 | 26 | 28 | 7 |
| Rasmussen | 12/17/2007 | 775 LV | 5 | 31 | 22 | 27 | 9 |
| InsiderAdvantage | 12/16-17/07 | 633 HLV | - | 24 | 26 | 27 | - |
| ABC/Post | 12/13-17/07 | 652 LV | 4 | 29 | 20 | 33 | 8 |
| Research 2000 | 12/10-13/07 | 500 LV | 3 | 24 | 24 | 33 | 9 |
| Diageo/Hotline | 12/7-12/07 | 569 LV | 5 | 27 | 22 | 27 | 8 |
| Rasmussen | 12/10/2007 | 1106 LV | 5 | 29 | 22 | 26 | 7 |
| Strategic Vision (R) | 12/8-10/07 | 600 LV | 4 | 25 | 24 | 33 | 4 |
| Newsweek | 12/5-6/07 | 395 LV | 4 | 29 | 18 | 35 | 9 |
| McClatchy-MSNBC | 12/3-6/07 | 400 LV | 5 | 27 | 21 | 25 | 9 |
| GSG (D-Edwards) | 12/3-5/07 | 503 LV | 6 | 27 | 24 | 22 | 9 |
| Strategic Vision (R) | 11/30-12/2/07 | 600 LV | 5 | 25 | 25 | 32 | 3 |
| Zogby | 11/29-12/01/07 | 514 LV | 5 | 27 | 21 | 24 | 8 |
| ARG | 11/26-29/07 | 600 LV | 8 | 25 | 23 | 27 | 4 |
| Register/Selzer | 11/25-28/07 | 500 LV | 6 | 25 | 23 | 28 | 9 |
| Rasmussen | 11/26-27/07 | 1156 LV | 4 | 27 | 24 | 25 | 10 |
| Strategic Vision (R) | 11/23-25/07 | 600 LV | 4 | 29 | 23 | 29 | 6 |
| Pew/AP | 11/7-25/07 | 460 LV | 2 | 31 | 19 | 26 | 10 |
| ABC/Post | 11/14-18/07 | 500 LV | 4 | 26 | 22 | 30 | 11 |
| Iowa State | 11/6-18/07 | 287 LV | 4 | 31 | 24 | 20 | 11 |
| Research 2000 | 11/12-14/07 | 400 LV | 4 | 27 | 21 | 25 | 10 |
| ARG | 11/10-14/07 | 600 LV | 5 | 27 | 20 | 21 | 12 |
| Rasmussen | 11/12/2007 | 1239 LV | 3 | 29 | 25 | 24 | 10 |
| Strategic Vision (R) | 11/9-12/07 | 600 LV | 5 | 29 | 20 | 27 | 7 |
| CBS/Times | 11/2-12/07 | 793 LV | 4 | 25 | 23 | 22 | 12 |
| Zogby | 11/6/2007 | 502 LV | 3 | 28 | 21 | 25 | 9 |
| ARG | 10/26-29/07 | 600 LV | 5 | 32 | 15 | 22 | 7 |
| U of Iowa | 10/17-24/07 | 306 LV | 5 | 29 | 20 | 27 | 7 |
| Strategic Vision (R) | 10/12-14/07 | 600 LV | 6 | 28 | 20 | 23 | 9 |
| Rasmussen | 10/10-14/07 | 1007 LV | 4 | 33 | 22 | 21 | 9 |
| Register/Selzer | 10/1-3/07 | 399 LV | 5 | 29 | 23 | 22 | 8 |
| ARG | 9/26-29/07 | 600 LV | 3 | 30 | 19 | 24 | 10 |
| Newsweek | 9/26-27/07 | LV | 5 | 24 | 22 | 28 | 10 |
| Strategic Vision (R) | 9/21-23/07 | 600 LV | 4 | 24 | 22 | 21 | 13 |
| Times/Blooomberg | 9/6-10/07 | 462 LV | 2 | 28 | 23 | 19 | 10 |
| ARG | 8/26-29/07 | 600 LV | 1 | 28 | 20 | 23 | 13 |
| TIME | 8/22-26/07 | 519 LV | 5 | 24 | 29 | 22 | 11 |
| Strategic Vision (R) | 8/17-19/07 | 600 LV | 5 | 21 | 23 | 22 | 14 |
| Zogby | 8/17-19/07 | 503 LV | 3 | 30 | 23 | 19 | 10 |
| Hart (D)/ McLaughlin (R) | 8/2-3/07 | 509 LV | 5 | 22 | 30 | 18 | 13 |
| ABC/Post | 7/26-31/07 | 500 LV | 2 | 26 | 26 | 27 | 11 |
| ARG | 7/26-30/07 | 600 LV | 3 | 30 | 21 | 15 | 13 |
| Research 2000 | 7/23-25/07 | 400 LV | 3 | 22 | 27 | 16 | 11 |
| ARG | 6/26-30/07 | 600 LV | 2 | 32 | 29 | 13 | 5 |
| Strategic Vision (R) | 6/22-24/07 | 600 LV | 4 | 20 | 26 | 21 | 11 |
| FMMA (D-Richardson) | 6/18-20/07 | 500 LV | 2 | 24 | 34 | 17 | 13 |
| Mason-Dixon | 6/13-16/07 | 400 LV | 4 | 22 | 21 | 18 | 6 |
| PPP (D) | 5/30/2007 | 1238 LV | 4 | 17 | 31 | 17 | 10 |
| ARG | 5/23-26/07 | 600 LV | 3 | 31 | 25 | 11 | 8 |
| Strategic Vision (R) | 5/18-20/07 | 600 LV | 3 | 16 | 29 | 24 | 9 |
| Register/Selzer | 5/12-16/07 | 400 LV | 3 | 21 | 29 | 23 | 10 |
| Research 2000 | 5/14-15/07 | 400 LV | 2 | 28 | 26 | 22 | 7 |
| Zogby | 5/14-15/07 | 511 LV | 5 | 21 | 24 | 23 | 6 |
| ARG | 4/27-30/07 | 600 LV | 6 | 23 | 27 | 19 | 5 |
| Strategic Vision (R) | 3/30-4/1/07 | 600 LV | 4 | 19 | 27 | 20 | 4 |
| Zogby | 3/26/2007 | 506 LV | 3 | 25 | 27 | 23 | 3 |
| ARG | 3/19-22/07 | 600 LV | 2 | 34 | 33 | 16 | 1 |
| Strategic Vision (R) | 2/16-2/18/07 | 600 LV | 5 | 18 | 24 | 18 | 3 |
| ARG | 2/2007 | 600 LV | 2 | 31 | 27 | 23 | 1 |
| Zogby | 2/7-9/07 | 500 LV | 4 | 24 | 24 | 18 | 0 |
| ARG | 1/29-2/1/07 | 600 LV | 2 | 35 | 18 | 14 | 1 |
| Strategic Vision (R) | 1/19-21/07 | 600 LV | 4 | 15 | 25 | 17 | 1 |
| Zogby | 1/15-16/07 | 596 LV | 3 | 16 | 27 | 17 | 1 |
| ARG | 12/19-23/06 | 600 LV | 2 | 31 | 20 | 10 | 1 |
| Research 2000 | 12/18-20/06 | 400 LV | 1 | 10 | 22 | 22 | 1 |
| Harstad (D) | 10/12-19/06 | 602 LV | 5 | 16 | 36 | 13 | 2 |
| Selzer & Co. | 5/29-6/1/06 | 399 LV | - | 26 | 30 | - | - |
| U of Iowa | 7/29-8/5/07 | 319 LV | - | 25 | 26 | 19 | 9 |
| FMMA (D-Richardson) | 6/18-20/07 | 500 LV | 3 | 23 | 31 | 16 | 18 |
| Zogby | 5/14-15/07 | 511 LV | 4 | 24 | 26 | 22 | 6 |
| U of Iowa | 3/19-31/07 | 298 LV | - | 29 | 34 | 19 | - |
* denotes a survey not plotted in our charts, click here for further explanation.
(Download printable .pdf with polling data for all active candidates.)
Trends of Varying Sensitivity
All Candidates
(Alternate Chart: All data since 2004)
