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Template:2016 Iowa Democratic presidential caucuses polls

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Poll source Date 1st 2nd Other
Caucus results February 1, 2016 Hillary Clinton
49.9%
Bernie Sanders
49.6%
Martin O'Malley 0.6%
Emerson College[1]
Margin of error: ± 5.6%
Sample size: 300
January 29–31, 2016 Hillary Clinton
51%
Bernie Sanders
43%
Martin O'Malley 4%
Undecided 2%
Quinnipiac University[2]
Margin of error: ± 3.2%
Sample size: 919
January 25–31, 2016 Bernie Sanders
49%
Hillary Clinton
46%
Martin O'Malley 3%
Undecided 2%
Des Moines Register– Bloomberg–Selzer[3]
Margin of error: ± 4%
Sample size: 602
January 26–29, 2016 Hillary Clinton
45%
Bernie Sanders
42%
Martin O'Malley 3%
Undecided or Not Committed 9%
Public Policy Polling[4]

Margin of error ± 3.4%
Sample size: 851

January 26–27, 2016 Hillary Clinton
48%
Bernie Sanders
40%
Martin O'Malley 7%
No preference 5%
Gravis Marketing[5]

Margin of error ± 3%
Sample size: 810

January 26–27, 2016 Hillary Clinton
53%
Bernie Sanders
42%
Martin O'Malley 5%
No preference 0%
Monmouth University[6]

Margin of error ± 4.4%
Sample size: 504

January 23–26, 2016 Hillary Clinton
47%
Bernie Sanders
42%
Martin O'Malley 6%
Undecided 5%
American Research Group[7]

Margin of error ± 5.0%
Sample size: 400

January 21–24, 2016 Bernie Sanders
48%
Hillary Clinton
45%
Martin O'Malley 3%
No preference 4%
Quinnipiac University[8]

Margin of error: ± 4%
Sample size: 606

January 18–24, 2016 Bernie Sanders
49%
Hillary Clinton
45%
Martin O'Malley 4%
Undecided 2%
ISU/WHO-HD[9]

Margin of error: ±
Sample size: 356

January 5–22, 2016 Hillary Clinton
47%
Bernie Sanders
45%
Martin O'Malley <1%
Undecided 7%
Fox News[10]

Margin of error ± 4.5%
Sample size: 432

January 18–21, 2016 Hillary Clinton
48%
Bernie Sanders
42%
Martin O'Malley 3%
No preference 7%
YouGov/CBS News[11]

Margin of error ± 8.9%
Sample size: 906

January 17–21, 2016 Bernie Sanders
47%
Hillary Clinton
46%
Martin O'Malley 5%
No preference 2%
Emerson College Polling Society[12]

Margin of error: ± 5.9%
Sample size: 271

January 18–20, 2016 Hillary Clinton
52%
Bernie Sanders
43%
Martin O'Malley 3%
Undecided 2%
CNN/ORC[13]

Margin of error: ± 6%
Sample size: 280

January 15–20, 2016 Bernie Sanders
51%
Hillary Clinton
43%
Martin O'Malley 4%
Undecided 2%
Monmouth College/KBUR[14]

Margin of error: ± 4.1%
Sample size: 500

January 18–19, 2016 Hillary Clinton
47.7%
Bernie Sanders
39.3%
Martin O'Malley 7.4%
Undecided 5%
Loras College[15]

Margin of error: ± 4.4%
Sample size: 580

January 8–10, 2016 Hillary Clinton
46%
Bernie Sanders
40%
Martin O'Malley 8%
Undecided 5%
Public Policy Polling[16]

Margin of error: ± 4.1%
Sample size: 580

January 8–10, 2016 Hillary Clinton
46%
Bernie Sanders
40%
Martin O'Malley 8%
Undecided 5%
Bloomberg/DMR[17]

Margin of error: ± 4.4%
Sample size: 503

January 7–10, 2016 Hillary Clinton
42%
Bernie Sanders
40%
Martin O'Malley 4%
Other/Undecided 14%
American Research Group[18]

Margin of error: ± 4.0%
Sample size: 600

January 6–10, 2016 Bernie Sanders
47%
Hillary Clinton
44%
Martin O'Malley 3%
Undecided 5%
Quinnipiac University[19]

Margin of error: ± 4.4%
Sample size: 492

January 5–10, 2016 Bernie Sanders
49%
Hillary Clinton
44%
Martin O'Malley 4%
Undecided 3%
Mason-Dixon/AARP[20]

Margin of error: ±
Sample size: 503

January 4–8, 2016 Hillary Clinton
49%
Bernie Sanders
42%
Martin O’Malley 5%
Not Reported 4%
NBC News/WSJ/Marist[21]

Margin of error: ± 4.8%
Sample size: 422

January 2–7, 2016 Hillary Clinton
48%
Bernie Sanders
45%
Martin O’Malley 5%
Undecided 3%
Polls in 2015
Poll source Date 1st 2nd Other
Gravis Marketing[22]

Margin of error ± 5%
Sample Size: 418

December 18–21, 2015 Hillary Clinton
49%
Bernie Sanders
31%
Martin O'Malley 10%
Unsure 10%
YouGov/CBS News[23]

Margin of error ± 5.3%
Sample Size: 1252

December 14–17, 2015 Hillary Clinton
50%
Bernie Sanders
45%
Martin O'Malley 4%
No preference 1%
Public Policy Polling[24]

Margin of error: ± 4.3%
Sample Size: 526

December 10–13, 2015 Hillary Clinton
52%
Bernie Sanders
34%
Martin O'Malley 7%
Undecided 6%
Quinnipiac University[25]

Margin of error: ± 3.6%
Sample Size: 727

December 4–13, 2015 Hillary Clinton
51%
Bernie Sanders
40%
Martin O'Malley 6%
Undecided 3%
Fox News[26]

Margin of error: ± 5.0%
Sample Size: 357

December 7–10, 2015 Hillary Clinton
50%
Bernie Sanders
36%
Martin O'Malley 5%
Other 4%
Undecided 10%
Loras College[27]

Margin of error: ± 4.4
Sample Size: 501

December 7–10, 2015 Hillary Clinton
59%
Bernie Sanders
27%
Martin O'Malley 4%
Undecided 10%
Des Moines Register/Bloomberg/Selzer[28]

Margin of error ± 4.9%
Sample Size: 404

December 7–10, 2015 Hillary Clinton
48%
Bernie Sanders
39%
Martin O'Malley 4%
Undeicded 8%
Monmouth[29] Margin of error ± 4.9%

Sample Size: 405

December 3–6, 2015 Hillary Clinton
55%
Bernie Sanders
33%
Martin O'Malley 6%
CNN/ORC[29] Margin of error ± 4.5%


Sample Size: 442

November 28 – December 6, 2015 Hillary Clinton
54%
Bernie Sanders
36%
Martin O'Malley 4%
Quinnipiac University[30]

Margin of error ± 4.2%
Sample Size: 543

November 16–22, 2015 Hillary Clinton
51%
Bernie Sanders
42%
Martin O'Malley 4%
Undecided 3%
YouGov/CBS News[31]

Margin of error ± 7.6%
Sample Size: 602

November 15–19, 2015 Hillary Clinton
50%
Bernie Sanders
44%
Martin O'Malley 5%
Undecided 1%
CNN/ORC[32]

Margin of error ± 4.5%
Sample Size: 498

October 29 – November 4, 2015 Hillary Clinton
55%
Bernie Sanders
37%
Martin O'Malley 3%
None 1%
No Opinion 3%
Gravis Marketing/One America News Network[33]

Margin of error ± 3.0%
Sample Size: 272

October 30 – November 2, 2015 Hillary Clinton
57.1%
Bernie Sanders
24.8%
Martin O'Malley 2.9%
Not Sure 15.2%
Public Policy Polling[34]

Margin of error ± 3.9%
Sample Size: 615

October 30 – November 1, 2015 Hillary Clinton
57%
Bernie Sanders
25%
Martin O'Malley 7%
Lawrence Lessig 1%
Not Sure 9%
KBUR-Monmouth[35]

Margin of error: ± 3.76%
Sample size: 681

October 29–31, 2015 Hillary Clinton
45.8%
Bernie Sanders
31.7%
Martin O'Malley 5.4%
Undecided 17.0%
Monmouth University[36]

Margin of error ± 3.76%
Sample size: 681

October 29–31, 2015 Hillary Clinton
45.8%
Bernie Sanders
31.7%
Martin O'Malley 5.4%
Undecided 17%
Monmouth University[37]

Margin of error ± 4.9%
Sample size: 400

October 22–25, 2015 Hillary Clinton
65%
Bernie Sanders
24%
Martin O'Malley 5%
Lawrence Lessig 1%
Undecided 5%
YouGov/CBS News[38]

Margin of error ± 6.9%
Sample size: 555

October 15–22, 2015 Hillary Clinton
46%
Bernie Sanders
43%
Martin O'Malley 3%
Lincoln Chafee 1%
Lawrence Lessig 0%
No preference 7%
Des Moines Register/Bloomberg Politics[39]

Margin of error ± 4.9%
Sample size: 402

October 16–19, 2015 Hillary Clinton
48%
Bernie Sanders
41%
Martin O'Malley 2%
Jim Webb 1%
Lincoln Chafee 1%
Uncommited 3%
Not Sure 4%
NBC News/WSJ/Marist[40]

Margin of error: ± 5.3%
Sample size: 348

September 23–30, 2015 Hillary Clinton
33%
Bernie Sanders
28%
Joe Biden 22%
Martin O'Malley 3%
Jim Webb 1%
Lincoln Chafee <1%
Undecided 12%
Hillary Clinton
47%
Bernie Sanders
36%
Martin O'Malley 4%
Jim Webb 1%
Lincoln Chafee <1%
Undecided 13%
Public Policy Polling[41]

Margin of error ± 4.4%
Sample size: 494

September 18–20, 2015 Hillary Clinton
43%
Bernie Sanders
22%
Joe Biden 17%
Martin O'Malley 3%
Jim Webb 3%
Lincoln Chafee 2%
Lawrence Lessig 0%
Undecided 9%
YouGov/CBS News[42]

Margin of error ± 6.6%
Sample size: 646

September 3–10, 2015 Bernie Sanders
43%
Hillary Clinton
33%
Joe Biden 10%
No preference 7%
Martin O'Malley 5%
Lincoln Chafee 1%
Jim Webb 1%
Quinnipiac University[43]

Margin of error: ± 3.4%
Sample size: 832

Posted September 10, 2015 Bernie Sanders
41%
Hillary Clinton
40%
Joe Biden 12%
Martin O'Malley 3%
NBC News/Marist Poll[44]

Margin of error: ± 5.3%
Sample size: 345

Published September 6, 2015 Hillary Clinton
38%
Bernie Sanders
27%
Joe Biden 20%
Martin O'Malley 4%
Jim Webb 2%
Lincoln Chafee 1%
Undecided 8%
Hillary Clinton
48%
Bernie Sanders
37%
Martin O'Malley 4%
Jim Webb 2%
Lincoln Chafee 1%
Undecided 8%
Loras College[45]

Margin of error ± 4.37%
Sample size: 502

August 24–27, 2015 Hillary Clinton
48.2%
Bernie Sanders
22.9%
Joe Biden 16.3%
Martin O'Malley 4%
Lincoln Chafee 0.6%
Jim Webb 0.4%
Undecided 6.4%
Selzer & Co. of Des Moines[46]

Margin of error: ± 4.9%
Sample size: 404

August 23–26, 2015 Hillary Clinton
43%
Bernie Sanders
35%
Martin O'Malley 5%
Jim Webb 2%
Lincoln Chafee 1%
Not sure 8%
Uncommitted 6%
Hillary Clinton
37%
Bernie Sanders
30%
Joe Biden 14%
Martin O'Malley 3%
Jim Webb 2%
Lincoln Chafee 1%
Not sure 8%
Uncommitted 6%
Suffolk University[47]

Margin of error: ± 4.4%
Sample size: 500

August 20–24, 2015 Hillary Clinton
54%
Bernie Sanders
20%
Joe Biden 11%
Martin O'Malley 4%
Jim Webb 1%
Lincoln Chafee 0%
Undecided 9%
CNN/ORC[48]

Margin of error: ± 4.5%
Sample size: 429

August 7–11, 2015 Hillary Clinton
50%
Bernie Sanders
31%
Joe Biden 12%
Martin O'Malley 1%
Jim Webb 1%
Lincoln Chafee 0%
Not sure 11%
Public Policy Polling[49]

Margin of error: ± 4.1%
Sample size: 567

August 7–9, 2015 Hillary Clinton
52%
Bernie Sanders
25%
Martin O'Malley 7%
Jim Webb 3%
Lincoln Chafee 1%
Not sure 11%
NBC News/Marist[50]

Margin of error: ± 5.5%
Sample size: 320

July 14–21, 2015 Hillary Clinton
49%
Bernie Sanders
25%
Joe Biden 10%
Martin O'Malley 3%
Jim Webb 1%
Lincoln Chafee <1%
Undecided 11%
We Ask America[51]

Margin of error: 3.07%
Sample size: 1,022

June 27–29, 2015 Hillary Clinton
63%
Bernie Sanders
20%
Martin O'Malley 5%
Jim Webb 3%
Lincoln Chafee 1%
Undecided 8%
Quinnipiac University[52]

Margin of error: 3.6%
Sample size: 761

June 20–29, 2015 Hillary Clinton
52%
Bernie Sanders
33%
Joe Biden 7%
Martin O'Malley 3%
Jim Webb 1%
Lincoln Chafee 0%
Undecided 5%
Bloomberg

Margin of error: 4.9%
Sample size: 401

June 19–22, 2015 Hillary Clinton
50%
Bernie Sanders
24%
Martin O'Malley 2%
Lincoln Chafee 0%
Undecided 23%
Morning Consult

Margin of error: ?
Sample size: 322

May 31 – June 8, 2015 Hillary Clinton
54%
Bernie Sanders
12%
Joe Biden 9%
Martin O'Malley 1%
Jim Webb 1%
Lincoln Chafee 0%
Other 3%
Undecided 20%
Gravis Marketing

Margin of error: ± 5.0%
Sample size: 434

May 28–29, 2015 Hillary Clinton
59%
Bernie Sanders
15%
Martin O'Malley 3%
Jim Webb 2%
Bill DeBlasio 2%
Lincoln Chafee 1%
Unsure 17%
Bloomberg/Des Moines

Margin of error: ± 4.7%
Sample size: 437

May 25–29, 2015 Hillary Clinton
57%
Bernie Sanders
16%
Joe Biden 8%
Martin O'Malley 2%
Jim Webb 2%
Uncommitted 6%
Not sure 8%
Quinnipiac University

Margin of error: ± 3.7%
Sample size: 692

April 25 – May 4, 2015 Hillary Clinton
60%
Bernie Sanders
15%
Joe Biden 11%
Martin O'Malley 3%
Jim Webb 3%
Lincoln Chafee 0%
Undecided 7%
Public Policy Polling

Margin of error: ± 4.5%
Sample size: 466

April 23–26, 2015 Hillary Clinton
62%
Bernie Sanders
14%
Martin O'Malley 6%
Jim Webb 3%
Lincoln Chafee 2%
Undecided 13%
Loras College

Margin of error: ± 4.4%
Sample size: 491

April 21–23, 2015 Hillary Clinton
57%
Elizabeth Warren
14.7%
Joe Biden 5.9%
Martin O'Malley 2.4%
Bernie Sanders 2%
Jim Webb 1.2%
Lincoln Chafee 0%
Undecided 16.7%
Quinnipiac

Margin of error: ± 3.9%
Sample size: 619

February 16–23, 2015 Hillary Clinton
61%
Elizabeth Warren
19%
Joe Biden 7%
Bernie Sanders 5%
Jim Webb 2%
Martin O'Malley 0%
Undecided 6%
NBC News/Marist

Margin of error: ± 5.5%
Sample size: 321

February 3–10, 2015 Hillary Clinton
68%
Joe Biden
12%
Bernie Sanders 7%
Jim Webb 1%
Martin O'Malley <1%
Undecided 12%
Selzer & Co.

Margin of error: ± 4.9%
Sample size: 401

January 26–29, 2015 Hillary Clinton
56%
Elizabeth Warren
16%
Joe Biden 9%
Bernie Sanders 5%
Jim Webb 3%
Martin O'Malley 1%
Uncommitted 4%
Not sure 6%
Loras College

Margin of error: ± 6.06%
Sample size: 261

January 21–26, 2015 Hillary Clinton
48.3%
Elizabeth Warren
16.5%
Joe Biden 12.6%
Bernie Sanders 3.8%
Jim Webb 2.3%
Martin O'Malley 0.4%
Undecided 16.1%
Polls in 2014
Poll source Date 1st 2nd Other
Fox News

Margin of error: ± 5%
Sample size: 352

October 28–30, 2014 Hillary Clinton
62%
Elizabeth Warren
14%
Joe Biden 10%
Andrew Cuomo 2%
Martin O'Malley 2%
Other 1%
None of the above 2%
Don't know 6%
Reuters/Ipsos

Margin of error: ± ?
Sample size: 552

October 23–29, 2014 Hillary Clinton
60%
Elizabeth Warren
17%
Joe Biden 4%
Andrew Cuomo 3%
Bernie Sanders 2%
Kirsten Gillibrand 1%
Martin O'Malley 1%
Wouldn't vote 12%
Selzer & Co.

Margin of error: ± 4.8%
Sample size: 426

October 1–7, 2014 Hillary Clinton
53%
Elizabeth Warren
10%
Joe Biden 9%
John Kerry 7%
Bernie Sanders 3%
Andrew Cuomo 1%
Brian Schweitzer 1%
Jim Webb 1%
Martin O'Malley 0%
Uncommitted 3%
Not sure 12%
CNN/ORC

Margin of error: ± 5.5%
Sample size: 309

September 8–10, 2014 Hillary Clinton
53%
Joe Biden
15%
Elizabeth Warren 7%
Bernie Sanders 5%
Andrew Cuomo 3%
Martin O'Malley 2%
Deval Patrick 1%
Someone else 1%
None/No opinion 15%
Suffolk

Margin of error: ± 7.09%
Sample size: 191

August 23–26, 2014 Hillary Clinton
66.49%
Elizabeth Warren
9.95%
Joe Biden 7.85%
Andrew Cuomo 4.19%
Martin O'Malley 2.09%
Undecided 7.85%
NBC News/Marist

Margin of error: ± 4.2%
Sample size: 539

July 7–13, 2014 Hillary Clinton
70%
Joe Biden
20%
Undecided 10%
Vox Populi Polling

Margin of error: ± 6.6%
Sample size: 223

June 4–5, 2014 Hillary Clinton
65%
Joe Biden
18%
Elizabeth Warren 12%
Andrew Cuomo 3%
Martin O'Malley 2%
Public Policy Polling

Margin of error: ±5.2%
Sample size: 356

May 15–19, 2014 Hillary Clinton
59%
Joe Biden
12%
Elizabeth Warren 11%
Cory Booker 3%
Andrew Cuomo 3%
Mark Warner 2%
Kirsten Gillibrand 1%
Martin O'Malley 1%
Brian Schweitzer 1%
Someone else/Not sure 8%
Joe Biden
34%
Elizabeth Warren
22%
Andrew Cuomo 7%
Cory Booker 4%
Kirsten Gillibrand 3%
Martin O'Malley 2%
Brian Schweitzer 1%
Mark Warner 1%
Someone else/Not sure 26%
Elizabeth Warren
31%
Andrew Cuomo
14%
Cory Booker 9%
Kirsten Gillibrand 5%
Martin O'Malley 2%
Mark Warner 2%
Brian Schweitzer 1%
Someone else/Not sure 36%
Suffolk

Margin of error: ± 8.4%
Sample size: 135

April 3–8, 2014 Hillary Clinton
62.96%
Elizabeth Warren
11.85%
Joe Biden 9.63%
Mark Warner 1.48%
Andrew Cuomo 0.74%
Deval Patrick 0.74%
Cory Booker 0%
Undecided 11.85%
Public Policy Polling

Margin of error: ±5.4%
Sample size: 335

February 20–23, 2014 Hillary Clinton
67%
Joe Biden
12%
Elizabeth Warren 5%
Mark Warner 3%
Andrew Cuomo 2%
Cory Booker 1%
Kirsten Gillibrand 0%
Martin O'Malley 0%
Brian Schweitzer 0%
Someone Else/Undecided 10%
Joe Biden
40%
Elizabeth Warren
13%
Andrew Cuomo 8%
Martin O'Malley 5%
Cory Booker 2%
Kirsten Gillibrand 2%
Mark Warner 2%
Brian Schweitzer 1%
Someone Else/Undecided 28%
Elizabeth Warren
21%
Andrew Cuomo
11%
Cory Booker 8%
Martin O'Malley 6%
Kirsten Gillibrand 3%
Brian Schweitzer 2%
Mark Warner 2%
Someone Else/Undecided 47%
Polls in 2013
Poll source Date 1st 2nd Other
Cygnal

Margin of error: ±2.1%
Sample size: 2,175

July 10–12, 2013 Hillary Clinton
55.6%
Joe Biden
7.8%
Elizabeth Warren 5%
Andrew Cuomo 1.1%
Kirsten Gillibrand 0.5%
Martin O'Malley 0.2%
Unsure 29.7%
Public Policy Polling

Margin of error: ±6.1%
Sample size: 260

July 5–7, 2013 Hillary Clinton
71%
Joe Biden
12%
Elizabeth Warren 5%
Kirsten Gillibrand 2%
Mark Warner 2%
Cory Booker 1%
Andrew Cuomo 1%
Martin O'Malley 1%
Brian Schweitzer 0%
Someone Else/Undecided 5%
Joe Biden
51%
Elizabeth Warren
16%
Andrew Cuomo 9%
Cory Booker 6%
Kirsten Gillibrand 2%
Martin O'Malley 2%
Mark Warner 1%
Brian Schweitzer 0%
Someone Else/Undecided 13%
Elizabeth Warren
20%
Andrew Cuomo
18%
Cory Booker 12%
Kirsten Gillibrand 7%
Martin O'Malley 4%
Brian Schweitzer 3%
Mark Warner 2%
Someone Else/Undecided 33%
Public Policy Polling

Margin of error: ±5.5%
Sample size: 313

February 1–3, 2013 Hillary Clinton
68%
Joe Biden
21%
Andrew Cuomo 2%
Mark Warner 2%
Elizabeth Warren 2%
Deval Patrick 1%
Kirsten Gillibrand 0%
Martin O'Malley 0%
Brian Schweitzer 0%
Someone Else/Undecided 3%
Joe Biden
58%
Andrew Cuomo
13%
Elizabeth Warren 7%
Kirsten Gillibrand 6%
Deval Patrick 3%
Mark Warner 2%
Brian Schweitzer 1%
Martin O'Malley 0%
Someone Else/Undecided 11%
Andrew Cuomo
26%
Elizabeth Warren
17%
Martin O'Malley 8%
Kirsten Gillibrand 5%
Deval Patrick 3%
Brian Schweitzer 2%
Mark Warner 2%
Someone Else/Undecided 37%
Harper Polling

Margin of error:
Sample size: 183

January 29, 2013 Hillary Clinton
65.38%
Joe Biden
13.74%
Andrew Cuomo 3.85%
Undecided 17.03%

References

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