| Sample | Sanders (D) | Clinton (D) |
|---|
IA: National Election Pool
Entrance Poll | 946.2 of 1660
Entering | 57% | 42% | 53% |
IA: Quinnipiac University
Jan 25-31, 2016 | 533.02 of 919
Likely | 58% | 39% | 56% |
IA: Emerson College
Jan 29-31, 2016 | 155 of 300
Likely | 51.67% | 27.1%
42 | 65.81%
102 |
IA: Public Policy Polling
Jan 26-27, 2016 | 493.58 of 851
Likely | 58% | 37% | 54% |
IA: Marist Institute for Public Opinion, NBC News, Wall Street Journal
Jan 24-26, 2016 | 251.34 of 426
Likely | 59% | 37% | 57% |
IA: Quinnipiac University
Jan 18-24, 2016 | 357.54 of 606
Likely | 59% | 40% | 54% |
IA: American Research Group
Jan 21-24, 2016 | 220 of 400
Likely | 55% | 41% | 51% |
IA: YouGov, CBS News
Jan 18-21, 2016 | 297 of 490
Likely | 60.61% | 44% | 47% |
IA: Anderson Robbins Research, Shaw & Company Research, Fox News
Jan 18-21, 2016 | ≤423
Likely | 34% | 56% |
IA: ORC International, CNN News
Jan 15-20, 2016 | ≤280
Likely | 38% | 56% |
IA: Emerson College
Jan 18-20, 2016 | 129 of 258
Likely | 50% | 27.91%
36 | 65.12%
84 |
IA: Loras College
Jan 13-18, 2016 | 275 of 500
Likely | 55% | 27.27%
75 | 64.36%
177 |
IA: Public Policy Polling
Jan 8-10, 2016 | 324.8 of 580
Likely | 56% | 36% | 52% |
IA: Quinnipiac University
Jan 5-10, 2016 | 275.52 of 492
Likely | 56% | 39% | 55% |
IA: American Research Group
Jan 6-10, 2016 | 216 of 400
Likely | 54% | 38% | 51% |
IA: Marist Institute for Public Opinion, NBC News
Jan 2-7, 2016 | ≤422
Likely | 35% | 56% |
IA: YouGov, CBS News
Dec 14-17, 2015 | 275 of 459
Likely | 59.91% | 44% | 54% |
IA: Quinnipiac University
Dec 4-13, 2015 | 421.66 of 727
Likely | 58% | 32% | 59% |
IA: Public Policy Polling
Dec 10-13, 2015 | 294.56 of 526
Registered | 56% | 34% | 55% |
IA: Loras College
Dec 7-10, 2015 | 275 of 501
Likely | 54.89% | 21.09%
58 | 62.91%
173 |
IA: Anderson Robbins Research, Shaw & Company Research, Fox News
Dec 10, 2015 | ≤357
Likely | 31% | 57% |
IA: ORC International, CNN News
11/28-12/6/2015 | ≤442
Likely | 34% | 57% |
IA: Quinnipiac University
Nov 16-22, 2015 | 309.51 of 543
Likely | 57% | 36% | 57% |
IA: YouGov, CBS News
Nov 15-19, 2015 | 359 of 602
Likely | 59.63% | 38% | 57% |
IA: ORC International, CNN News
10/29-11/4/2015 | ≤498
Likely | 31% | 62% |
IA: Public Policy Polling
10/30-11/1/2015 | 358.44 of 618
Registered | 58% | 21% | 61% |
IA: Douglas Fulmer & Associates, KBUR-AM (Burlington, Iowa), Monmouth College
Oct 29-31, 2015 | 372 of 681
Likely | 54.63% | 31.2% | 41.4% |
IA: YouGov, CBS News
Oct 15-22, 2015 | 310 of 555
Likely | 55.86% | 35% | 46% |
IA: Loras College
Oct 19-22, 2015 | 260 of 500
Likely | 52% | 18.08%
47 | 66.92%
174 |
IA: Quinnipiac University
Oct 14-20, 2015 | 361.12 of 592
Likely | 61% | 33% | 59% |
IA: Marist Institute for Public Opinion, NBC News, Wall Street Journal
Sep 23-30, 2015 | 212.28 of 348
Registered | 61% | 27% | 52% |
IA: Public Policy Polling
Sep 18-20, 2015 | 291.46 of 494
Registered | 59% | 15% | 48% |
IA: YouGov, CBS News
Sep 3-10, 2015 | 387 of 646
Likely | 59.91% | 41% | 36% |
IA: Quinnipiac University
8/27-9/8/2015 | 457.6 of 832
Likely | 55% | 35% | 49% |
IA: Marist Institute for Public Opinion, NBC News
8/26-9/2/2015 | 217.35 of 345
Registered | 63% | 31% | 54% |
IA: Loras College
Aug 24-27, 2015 | 262 of 502
Likely | 52.19% | 21.37%
56 | 54.2%
142 |
IA: Suffolk University
Aug 20-24, 2015 | 285 of 500
Likely | 57% | 15.44%
44 | 58.25%
166 |
IA: ORC International, CNN News
Aug 7-11, 2015 | ≤429
Likely | 26% | 58% |
IA: Public Policy Polling
Aug 7-9, 2015 | 328.86 of 567
Registered | 58% | 21% | 56% |
IA: Marist Institute for Public Opinion, NBC News
Jul 14-21, 2015 | 169.6 of 320
Registered | 53% | 16% | 63% |
IA: We Ask America, KBUR-AM (Burlington, Iowa), Monmouth College
Jun 27-29, 2015 | 560 of 1022
Likely | 54.79% | 14.29% | 68.69% |
IA: Quinnipiac University
Jun 20-29, 2015 | 441.38 of 761
Likely | 58% | 29% | 56% |
IA: Morning Consult
5/31-6/8/2015 | 180 of 322
Likely | 55.9% | 8.89%
16 | 52.22%
94 |
IA: Quinnipiac University
4/25-5/4/2015 | 415.2 of 692
Likely | 60% | 12% | 68% |
IA: Public Policy Polling
Apr 26, 2015 | 265.62 of 466
Likely | 57% | 11% | 68% |
IA: Quinnipiac University
Feb 16-23, 2015 | 334.26 of 619
Likely | 54% | 2% | 69% |
IA: Marist Institute for Public Opinion, NBC News
Feb 3-10, 2015 | 195.81 of 321
Registered | 61% | 5% | 73% |
IA: Loras College
Jan 21-26, 2015 | 142 of 261
Likely | 54.41% | 2.11%
3 | 11.27%
16 |
IA: ORC International, CNN News
Sep 8-10, 2014 | ≤309
Likely | 2% | 63% |
IA: Suffolk University, USA Today
Aug 23-26, 2014 | 108 of 191
Likely | 56.54% | | 69.44%
75 |
IA: Public Policy Polling
May 15-19, 2014 | 202.92 of 356
Registered | 57% | | 62% |
IA: Suffolk University
Apr 3-8, 2014 | 70 of 135
Likely | 51.85% | | 72.86%
51 |
IA: Public Policy Polling
Feb 23, 2014 | 194.3 of 335
Registered | 58% | | 71% |
IA: Harper Polling, Conservative Intelligence Briefing
Nov 23-24, 2013 | 160.16 of 308
Likely | 52% | | 72.5% |
IA: Public Policy Polling
Jul 5-7, 2013 | 156 of 260
Registered | 60% | | 72% |
IA: Public Policy Polling
1/31-2/3/2013 | 241.28 of 416
Registered | 58% | | 67% |
IA: Harper Polling, Conservative Intelligence Briefing
Jan 29, 2013 | ≤183
Likely | | 69.72% |
IA: Public Policy Polling
Jul 12-15, 2012 | 237.12 of 416
Likely | 57% | | 63% |
IA: Public Policy Polling
May 3-6, 2012 | 190.95 of 335
Likely | 57% | | 66% |