Statewide public opinion polls conducted relating to the 2008 Democratic Party presidential primaries include the following. A graphic summary of the data in map form follows. For state and territory names abbreviated in the maps in this article, see: List of US postal abbreviations.
The following table shows a summary of the most recent polling data for each state, as well as completed primary and caucus results. Totals for withdrawn candidates have been placed in the "Uncommitted/Other" and "Other" columns. The pledged delegate vote estimates come from each state's primary or caucus article. Click on the specific election (link) column to see the sources used in those articles.
| Date | State | Delegates | Hillary Clinton | Barack Obama | Uncommitted/ other | Hillary Clinton | Barack Obama | Other |
|---|---|---|---|---|---|---|---|---|
| 2008-01-03 | Iowa | 45 | 29% | 38% | 33% | 14 | 24 | 7 |
| 2008-01-08 | New Hampshire | 22 | 39% | 36% | 24% | 9 | 9 | 4 |
| 2008-01-15 | Michigan1 | 128 | 55% | -† | 45% | 73 | 55 | 0 |
| 2008-01-19 | Nevada | 25 | 51% | 45% | 4% | 11 | 14 | 0 |
| 2008-01-26 | South Carolina | 45 | 27% | 55% | 18% | 12 | 25 | 8 |
| 2008-01-29 | Florida1 | 185 | 50% | 33% | 17% | 105 | 67 | 13 |
| 2008-02-05 | 52 | 42% | 56% | 2% | 25 | 27 | 0 | |
| 2008-02-05 | Alaska | 13 | 25% | 75% | 0% | 4 | 9 | 0 |
| 2008-02-05 | American Samoa | 3 | 57% | 43% | 0% | 2 | 1 | 0 |
| 2008-02-05 | Arizona | 56 | 51% | 42% | 7% | 31 | 25 | 0 |
| 2008-02-05 | Arkansas | 35 | 70% | 27% | 3% | 27 | 8 | 0 |
| 2008-02-05 | California | 370 | 52% | 43% | 6% | 204 | 166 | 0 |
| 2008-02-05 | Colorado | 55 | 32% | 67% | 1% | 20 | 35 | 0 |
| 2008-02-05 | Connecticut | 48 | 47% | 51% | 2% | 22 | 26 | 0 |
| 2008-02-05 | Delaware | 15 | 43% | 53% | 4% | 6 | 9 | 0 |
| 2008-02-05 | Georgia | 87 | 31% | 67% | 2% | 27 | 60 | 0 |
| 2008-02-05 | Idaho | 18 | 17% | 79% | 1% | 3 | 15 | 0 |
| 2008-02-05 | Illinois | 153 | 33% | 65% | 2% | 49 | 104 | 0 |
| 2008-02-05 | Kansas | 32 | 26% | 74% | 0% | 9 | 23 | 0 |
| 2008-02-05 | Massachusetts | 93 | 56% | 41% | 3% | 55 | 38 | 0 |
| 2008-02-05 | Minnesota | 72 | 32% | 67% | 1% | 24 | 48 | 0 |
| 2008-02-05 | Missouri | 72 | 48% | 49% | 3% | 36 | 36 | 0 |
| 2008-02-05 | New Jersey | 107 | 54% | 44% | 2% | 59 | 48 | 0 |
| 2008-02-05 | New Mexico | 26 | 49% | 48% | 3% | 14 | 12 | 0 |
| 2008-02-05 | New York | 232 | 57% | 40% | 3% | 139 | 93 | 0 |
| 2008-02-05 | North Dakota | 13 | 37% | 61% | 2% | 5 | 8 | 0 |
| 2008-02-05 | Oklahoma | 38 | 55% | 31% | 14% | 24 | 14 | 0 |
| 2008-02-05 | 68 | 54% | 41% | 5% | 40 | 28 | 0 | |
| 2008-02-05 | Utah | 23 | 39% | 57% | 4% | 9 | 14 | 0 |
| 2008-02-09 | Louisiana | 56 | 36% | 57% | 7% | 22 | 34 | 0 |
| 2008-02-09 | Nebraska | 24 | 32% | 68% | 0% | 8 | 16 | 0 |
| 2008-02-09 | 3 | 8% | 92% | 0% | 0 | 3 | 0 | |
| 2008-02-09 | Washington caucus | 78 | 31% | 68% | 1% | 26 | 52 | 0 |
| 2008-02-10 | Maine | 24 | 40% | 59% | 1% | 9 | 15 | 0 |
| 2008-02-12 | 7 | 33% | 66% | 1% | 2.5 | 4.5 | 0 | |
| 2008-02-12 | District of Columbia | 15 | 24% | 75% | 1% | 3 | 12 | 0 |
| 2008-02-12 | Maryland | 70 | 36% | 61% | 3% | 28 | 42 | 0 |
| 2008-02-12 | Virginia | 83 | 35% | 64% | 1% | 29 | 54 | 0 |
| 2008-02-19 | Hawaii | 20 | 24% | 76% | 0% | 6 | 14 | 0 |
| 2008-02-19 | Wisconsin | 74 | 41% | 58% | 1% | 32 | 42 | 0 |
| 2008-03-04 | Ohio | 141 | 54% | 44% | 2% | 75 | 66 | 0 |
| 2008-03-04 | Rhode Island | 21 | 58% | 40% | 2% | 13 | 8 | 0 |
| 2008-03-04 | Texas primary | 126 | 51% | 47% | 2% | 65 | 61 | 0 |
| 2008-03-04 | Texas caucus | 67 | 44% | 56% | 0% | 30 | 37 | 0 |
| 2008-03-04 | Vermont | 15 | 39% | 59% | 2% | 6 | 9 | 0 |
| 2008-03-08 | Wyoming | 12 | 38% | 61% | 1% | 5 | 7 | 0 |
| 2008-03-11 | Mississippi | 33 | 37% | 61% | 2% | 14 | 19 | 0 |
| 2008-04-22 | Pennsylvania | 158 | 55% | 45% | 0% | 85 | 73 | 0 |
| 2008-05-03 | Guam | 4 | 50% | 50% | 0% | 2 | 2 | 0 |
| 2008-05-06 | Indiana | 72 | 51% | 49% | 0% | 39 | 33 | 0 |
| 2008-05-06 | North Carolina | 115 | 42% | 56% | 2% | 50 | 65 | 0 |
| 2008-05-13 | West Virginia | 28 | 67% | 26% | 7% | 20 | 8 | 0 |
| 2008-05-20 | Kentucky | 51 | 65% | 30% | 5% | 37 | 14 | 0 |
| 2008-05-20 | Oregon | 52 | 41% | 58% | 1% | 21 | 31 | 0 |
| 2008-06-01 | Puerto Rico | 55 | 68% | 32% | 1% | 38 | 17 | 0 |
| 2008-06-03 | Montana | 16 | 41% | 56% | 3% | 7 | 9 | |
| 2008-06-03 | South Dakota | 15 | 55% | 45% | 0% | 9 | 6 | |
| Total | 3,545 | 1,744.5 | 1,787.5 | 32 | ||||