| Sample | Sanders (D) | Clinton (D) |
---|
IA: Quinnipiac University Jan 18-24, 2016 | 606 Likely | 49% | 45% |
IA: American Research Group Jan 21-24, 2016 | 400 Likely | 48% | 45% |
IA: Iowa State University Jan 5-22, 2016 | 356 Registered | 45% | 47.4% |
IA: YouGov, CBS News Jan 18-21, 2016 | 490 Likely | 47% | 46% |
IA: Anderson Robbins Research, Shaw & Company Research, Fox News Jan 18-21, 2016 | 423 Likely | 42% | 48% |
IA: ORC International, CNN News Jan 15-20, 2016 | 280 Likely | 51% | 43% |
IA: Emerson College Jan 18-20, 2016 | 258 Likely | 36.43% 94 | 51.94% 134 |
IA: Douglas Fulmer & Associates, KBUR-AM (Burlington, Iowa), Monmouth College Jan 18-19, 2016 | 570 Likely | 45.16% 224 | 54.84% 272 |
IA: Loras College Jan 13-18, 2016 | 500 Likely | 29.8% 149 | 58.6% 293 |
IA: Gravis Marketing, One America News Network Jan 11-12, 2016 | 461 Likely | 36% | 57% |
IA: Public Policy Polling Jan 8-10, 2016 | 580 Likely | 40% | 46% |
IA: Selzer & Company, Bloomberg, Des Moines Register Jan 7-10, 2016 | 503 Likely | 40% | 42% |
IA: Quinnipiac University Jan 5-10, 2016 | 492 Likely | 49% | 44% |
IA: American Research Group Jan 6-10, 2016 | 400 Likely | 47% | 44% |
IA: Marist Institute for Public Opinion, NBC News Jan 2-7, 2016 | 422 Likely | 45% | 48% |
IA: Gravis Marketing Dec 19-21, 2015 | 418 Likely | 31% | 49% |
IA: YouGov, CBS News Dec 14-17, 2015 | 459 Likely | 45% | 50% |
IA: Quinnipiac University Dec 4-13, 2015 | 727 Likely | 40% | 51% |
IA: Public Policy Polling Dec 10-13, 2015 | 526 Registered | 34% | 52% |
IA: Loras College Dec 7-10, 2015 | 501 Likely | 27.35% 137 | 58.88% 295 |
IA: Selzer & Company, Bloomberg, Des Moines Register Dec 7-10, 2015 | 404 Likely | 39% | 48% |
IA: Anderson Robbins Research, Shaw & Company Research, Fox News Dec 10, 2015 | 357 Likely | 36% | 50% |
IA: OvertimePolitics.com Dec 4-8, 2015 | 433 Likely | 44.42% 171 | 55.58% 214 |
IA: ORC International, CNN News 11/28-12/6/2015 | 442 Likely | 36% | 54% |
IA: Monmouth University Polling Institute Dec 3-6, 2015 | 405 Likely | 33% | 55% |
IA: Quinnipiac University Nov 16-22, 2015 | 543 Likely | 42% | 51% |
IA: YouGov, CBS News Nov 15-19, 2015 | 602 Likely | 44% | 50% |
IA: Morning Consult Nov 10-16, 2015 | 211 Likely | 40.51% 79 | 59.49% 116 |
IA: Iowa State University Nov 2-15, 2015 | 496 Registered | 27.8% | 49.5% |
IA: ORC International, CNN News 10/29-11/4/2015 | 498 Likely | 37% | 55% |
IA: Public Policy Polling 10/30-11/1/2015 | 618 Registered | 25% | 57% |
IA: Douglas Fulmer & Associates, KBUR-AM (Burlington, Iowa), Monmouth College Oct 29-31, 2015 | 681 Likely | 31.72% 216 | 45.81% 312 |
IA: Gravis Marketing, One America News Network Oct 26, 2015 | 273 Registered | 24.8% | 57.1% |
IA: Monmouth University Polling Institute Oct 22-25, 2015 | 400 Likely | 24% | 68% |
IA: YouGov, CBS News Oct 15-22, 2015 | 555 Likely | 41% | 42% |
IA: Loras College Oct 19-22, 2015 | 500 Likely | 23.6% 118 | 61.6% 308 |
IA: Quinnipiac University Oct 14-20, 2015 | 592 Likely | 40% | 51% |
IA: Selzer & Company, Bloomberg, Des Moines Register Oct 16-19, 2015 | 402 Likely | 37% | 42% |
IA: Marist Institute for Public Opinion, NBC News, Wall Street Journal Sep 23-30, 2015 | 348 Registered | 36% | 47% |
IA: Gravis Marketing, One America News Network Sep 25-27, 2015 | 328 Registered | 30.6% | 39.5% |
IA: Public Policy Polling Sep 18-20, 2015 | 494 Registered | 22% | 43% |
IA: YouGov, CBS News Sep 3-10, 2015 | 646 Likely | 43% | 33% |
IA: Quinnipiac University 8/27-9/8/2015 | 832 Likely | 41% | 40% |
IA: Marist Institute for Public Opinion, NBC News 8/26-9/2/2015 | 345 Registered | 37% | 48% |
IA: Gravis Marketing Aug 29-31, 2015 | 421 Registered | 16.9% | 45.1% |
IA: Loras College Aug 24-27, 2015 | 502 Likely | 22.91% 115 | 48.21% 242 |
IA: Selzer & Company, Bloomberg, Des Moines Register Aug 23-26, 2015 | 404 Likely | 30% | 37% |
IA: Suffolk University Aug 20-24, 2015 | 500 Likely | 19.8% 99 | 53.8% 269 |
IA: ORC International, CNN News Aug 7-11, 2015 | 429 Likely | 31% | 50% |
IA: Public Policy Polling Aug 7-9, 2015 | 567 Registered | 25% | 52% |
IA: Gravis Marketing, One America News Network Jul 29, 2015 | 236 Registered | 24% | 50.8% |
IA: Marist Institute for Public Opinion, NBC News Jul 14-21, 2015 | 320 Registered | 26% | 55% |
IA: We Ask America, KBUR-AM (Burlington, Iowa), Monmouth College Jun 27-29, 2015 | 1022 Likely | 20.16% | 62.82% |
IA: Quinnipiac University Jun 20-29, 2015 | 761 Likely | 33% | 52% |
IA: Selzer & Company, Bloomberg, Des Moines Register Jun 19-22, 2015 | 401 Likely | 24% | 50% |
IA: Morning Consult 5/31-6/8/2015 | 322 Likely | 12.11% 39 | 54.04% 174 |
IA: Selzer & Company, Bloomberg, Des Moines Register May 25-29, 2015 | 437 Likely | 16% | 57% |
IA: Gravis Marketing, Townhall.com May 28-29, 2015 | 434 Registered | 15% | 59% |
IA: Quinnipiac University 4/25-5/4/2015 | 692 Likely | 15% | 60% |
IA: Public Policy Polling Apr 26, 2015 | 466 Likely | 14% | 62% |
IA: Loras College Apr 21-23, 2015 | 491 Likely | 2.04% 10 | 57.03% 280 |
IA: Quinnipiac University Feb 16-23, 2015 | 619 Likely | 5% | 61% |
IA: Marist Institute for Public Opinion, NBC News Feb 3-10, 2015 | 321 Registered | 7% | 68% |
IA: Selzer & Company, Bloomberg, Des Moines Register Jan 26-29, 2015 | 401 Likely | 5% | 56% |
IA: Loras College Jan 21-26, 2015 | 261 Likely | 3.83% 10 | 48.28% 126 |
IA: Anderson Robbins Research, Shaw & Company Research, Fox News Oct 28-30, 2014 | 352 Likely | | 62% |
IA: Selzer & Company, Bloomberg, Des Moines Register Oct 1-7, 2014 | 426 Likely | 3% | 53% |
IA: ORC International, CNN News Sep 8-10, 2014 | 309 Likely | 5% | 53% |
IA: Suffolk University, USA Today Aug 23-26, 2014 | 191 Likely | | 66.49% 127 |
IA: Vox Populi Polling Jun 4-5, 2014 | 223 Likely | | 65% |
IA: Public Policy Polling May 15-19, 2014 | 356 Registered | | 59% |
IA: Vox Populi Polling, Daily Caller Apr 22-24, 2014 | 204 Likely | | 71% |
IA: Suffolk University Apr 3-8, 2014 | 135 Likely | | 62.96% 85 |
IA: Public Policy Polling Feb 23, 2014 | 335 Registered | | 67% |
IA: Harper Polling, Conservative Intelligence Briefing Nov 23-24, 2013 | 308 Likely | | 71% |
IA: Public Policy Polling Jul 5-7, 2013 | 260 Registered | | 71% |
IA: Public Policy Polling 1/31-2/3/2013 | 416 Registered | | 58% |
IA: Harper Polling, Conservative Intelligence Briefing Jan 29, 2013 | 183 Likely | | 65% |
IA: Public Policy Polling Jul 12-15, 2012 | 416 Likely | | 60% |
IA: Public Policy Polling May 3-6, 2012 | 335 Likely | | 62% |