United States Senate election in Florida, 2004 Polling Polling

| Poll_Source | Dates_administered | Sample_size | Margin_of_Error | Mel_Martinez_R | Betty_Castor_D |
|---|---|---|---|---|---|
| Quinnipiac University | October 15 | 808 | ± 3.5% | 47% | 47% |
| Survey USA | October 15 | 596 | ± 4.1% | 49% | 47% |
| Mason-Dixon | October 14 | 625 | ± 4.0% | 45% | 45% |
| UNF | October 10 | 641 | ± 4.0% | 35% | 38% |
| Mason-Dixon | October 4 | 625 | ± 4.0% | 46% | 41% |
| Quinnipiac University | October 1 | 706 | ± 3.8% | 48% | 47% |
| Survey USA | October 1 | 706 | ± 3.8% | 50% | 46% |
| Gallup | Sept. 18 | 674 | ± 4.0% | 45% | 51% |
| Quinnipiac University | Sept. 18 | 819 | ± 3.4% | 42% | 43% |
| Survey USA | Sept. 12 | 602 | ± 4.1% | 45% | 49% |
| Rasmussen Reports | August 24 | 500 | ± 4.5% | 44% | 44% |