| Sample | Sanders (D) | Clinton (D) |
|---|
IA: National Election Pool
Entrance Poll | 713.8 of 1660
Entering | 43% | 50% | 44% |
IA: Quinnipiac University
Jan 25-31, 2016 | 385.98 of 919
Likely | 42% | 63% | 32% |
IA: Emerson College
Jan 29-31, 2016 | 145 of 300
Likely | 48.33% | 58.62%
85 | 34.48%
50 |
IA: Public Policy Polling
Jan 26-27, 2016 | 357.42 of 851
Likely | 42% | 44% | 40% |
IA: Marist Institute for Public Opinion, NBC News, Wall Street Journal
Jan 24-26, 2016 | 174.66 of 426
Likely | 41% | 58% | 35% |
IA: Quinnipiac University
Jan 18-24, 2016 | 248.46 of 606
Likely | 41% | 63% | 32% |
IA: American Research Group
Jan 21-24, 2016 | 180 of 400
Likely | 45% | 56% | 38% |
IA: YouGov, CBS News
Jan 18-21, 2016 | 193 of 490
Likely | 39.39% | 51% | 43% |
IA: Anderson Robbins Research, Shaw & Company Research, Fox News
Jan 18-21, 2016 | ≤423
Likely | 51% | 39% |
IA: ORC International, CNN News
Jan 15-20, 2016 | ≤280
Likely | 63% | 32% |
IA: Emerson College
Jan 18-20, 2016 | 130 of 258
Likely | 50.39% | 56.92%
74 | 38.46%
50 |
IA: Loras College
Jan 13-18, 2016 | 225 of 500
Likely | 45% | 32.89%
74 | 51.56%
116 |
IA: Public Policy Polling
Jan 8-10, 2016 | 255.2 of 580
Likely | 44% | 46% | 39% |
IA: Quinnipiac University
Jan 5-10, 2016 | 216.48 of 492
Likely | 44% | 61% | 30% |
IA: American Research Group
Jan 6-10, 2016 | 184 of 400
Likely | 46% | 57% | 36% |
IA: Marist Institute for Public Opinion, NBC News
Jan 2-7, 2016 | ≤422
Likely | 56% | 39% |
IA: YouGov, CBS News
Dec 14-17, 2015 | 182 of 459
Likely | 39.65% | 47% | 44% |
IA: Quinnipiac University
Dec 4-13, 2015 | 305.34 of 727
Likely | 42% | 52% | 39% |
IA: Public Policy Polling
Dec 10-13, 2015 | 231.44 of 526
Registered | 44% | 34% | 49% |
IA: Loras College
Dec 7-10, 2015 | 226 of 501
Likely | 45.11% | 34.96%
79 | 53.98%
122 |
IA: Anderson Robbins Research, Shaw & Company Research, Fox News
Dec 10, 2015 | ≤357
Likely | 42% | 40% |
IA: ORC International, CNN News
11/28-12/6/2015 | ≤442
Likely | 40% | 51% |
IA: Quinnipiac University
Nov 16-22, 2015 | 233.49 of 543
Likely | 43% | 51% | 42% |
IA: YouGov, CBS News
Nov 15-19, 2015 | 243 of 602
Likely | 40.37% | 53% | 40% |
IA: ORC International, CNN News
10/29-11/4/2015 | ≤498
Likely | 44% | 48% |
IA: Public Policy Polling
10/30-11/1/2015 | 259.56 of 618
Registered | 42% | 31% | 51% |
IA: Douglas Fulmer & Associates, KBUR-AM (Burlington, Iowa), Monmouth College
Oct 29-31, 2015 | 309 of 681
Likely | 45.37% | 32.4% | 51.1% |
IA: YouGov, CBS News
Oct 15-22, 2015 | 244 of 555
Likely | 43.96% | 48% | 37% |
IA: Loras College
Oct 19-22, 2015 | 240 of 500
Likely | 48% | 29.58%
71 | 55.83%
134 |
IA: Quinnipiac University
Oct 14-20, 2015 | 230.88 of 592
Likely | 39% | 51% | 39% |
IA: Marist Institute for Public Opinion, NBC News, Wall Street Journal
Sep 23-30, 2015 | 135.72 of 348
Registered | 39% | 48% | 39% |
IA: Public Policy Polling
Sep 18-20, 2015 | 202.54 of 494
Registered | 41% | 19% | 36% |
IA: YouGov, CBS News
Sep 3-10, 2015 | 258 of 646
Likely | 39.94% | 47% | 29% |
IA: Quinnipiac University
8/27-9/8/2015 | 374.4 of 832
Likely | 45% | 49% | 28% |
IA: Marist Institute for Public Opinion, NBC News
8/26-9/2/2015 | 127.65 of 345
Registered | 37% | 45% | 38% |
IA: Loras College
Aug 24-27, 2015 | 240 of 502
Likely | 47.81% | 24.58%
59 | 41.67%
100 |
IA: Suffolk University
Aug 20-24, 2015 | 215 of 500
Likely | 43% | 25.58%
55 | 47.91%
103 |
IA: ORC International, CNN News
Aug 7-11, 2015 | ≤429
Likely | 37% | 38% |
IA: Public Policy Polling
Aug 7-9, 2015 | 238.14 of 567
Registered | 42% | 30% | 47% |
IA: Marist Institute for Public Opinion, NBC News
Jul 14-21, 2015 | 150.4 of 320
Registered | 47% | 37% | 45% |
IA: We Ask America, KBUR-AM (Burlington, Iowa), Monmouth College
Jun 27-29, 2015 | 462 of 1022
Likely | 45.21% | 30.77% | 52.2% |
IA: Quinnipiac University
Jun 20-29, 2015 | 319.62 of 761
Likely | 42% | 37% | 46% |
IA: Morning Consult
5/31-6/8/2015 | 142 of 322
Likely | 44.1% | 16.2%
23 | 56.34%
80 |
IA: Quinnipiac University
4/25-5/4/2015 | 276.8 of 692
Likely | 40% | 20% | 49% |
IA: Public Policy Polling
Apr 26, 2015 | 200.38 of 466
Likely | 43% | 18% | 54% |
IA: Quinnipiac University
Feb 16-23, 2015 | 284.74 of 619
Likely | 46% | 9% | 51% |
IA: Marist Institute for Public Opinion, NBC News
Feb 3-10, 2015 | 125.19 of 321
Registered | 39% | 11% | 58% |
IA: Loras College
Jan 21-26, 2015 | 119 of 261
Likely | 45.59% | 5.88%
7 | 14.29%
17 |
IA: ORC International, CNN News
Sep 8-10, 2014 | ≤309
Likely | 9% | 40% |
IA: Suffolk University, USA Today
Aug 23-26, 2014 | 83 of 191
Likely | 43.46% | | 62.65%
52 |
IA: Public Policy Polling
May 15-19, 2014 | 153.08 of 356
Registered | 43% | | 55% |
IA: Suffolk University
Apr 3-8, 2014 | 65 of 135
Likely | 48.15% | | 52.31%
34 |
IA: Public Policy Polling
Feb 23, 2014 | 140.7 of 335
Registered | 42% | | 60% |
IA: Harper Polling, Conservative Intelligence Briefing
Nov 23-24, 2013 | 147.84 of 308
Likely | 48% | | 68.92% |
IA: Public Policy Polling
Jul 5-7, 2013 | 104 of 260
Registered | 40% | | 69% |
IA: Public Policy Polling
1/31-2/3/2013 | 174.72 of 416
Registered | 42% | | 47% |
IA: Harper Polling, Conservative Intelligence Briefing
Jan 29, 2013 | ≤183
Likely | | 58.9% |
IA: Public Policy Polling
Jul 12-15, 2012 | 178.88 of 416
Likely | 43% | | 55% |
IA: Public Policy Polling
May 3-6, 2012 | 144.05 of 335
Likely | 43% | | 57% |