Template:2016 Iowa Democratic presidential caucuses polls

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%
	September 23–30, 2015	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%
	Published September 6, 2015	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%
	August 23–26, 2015	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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[ECPS-1Feb-1] "TRUMP BY A NOSE OVER CRUZ; RUBIO GAINS MOMENTUM AND CLINTON MAINTAINS LEAD OVER SANDERS" (PDF). Emerson College Polling Society. 1 February 2016. Retrieved 5 February 2016.

[2] "FIRST-TIMERS PUT TRUMP AHEAD IN IOWA GOP CAUCUS, QUINNIPIAC UNIVERSITY POLL FINDS; SANDERS NEEDS FIRST-TIMERS TO TIE CLINTON IN DEM CAUCUS" (PDF). Quinnipiac University Poll. 1 February 2016. Retrieved 5 February 2016.

[3] Eller, Donnelle; Jacobs, Jennifer (30 January 2016). "Clinton keeps slim edge over Sanders in latest Iowa Poll". The Des Moines Register. Retrieved 5 February 2016.

[4] "NBC News/WSJ/Marist Poll" (PDF). MSNBC. 28 January 2016. Retrieved 5 February 2016.

[5] "Iowa Polling Results". OAN. Retrieved 5 February 2016.

[6] "IOWA: CLINTON CLINGS TO CAUCUS LEAD" (PDF). Monmouth University Poll. 28 January 2016. Retrieved 5 February 2016.

[7] "Iowa". American Research Group, Inc. Retrieved 5 February 2016.

[8] "Sanders-Clinton Close Race Frozen In Iowa, Quinnipiac University Poll Finds; Men, Very Liberals, Young Voters Back Sanders". Quinnipiac University. Retrieved 2016-01-27.

[9] "Clinton, Cruz Lead Among Iowa Caucusgoers in WHO-HD, Iowa State University Poll". WHO TV. 25 January 2016. Retrieved 5 February 2016.

[10] "Fox News Poll: Sanders narrows gap in Iowa". Fox News. Retrieved 5 February 2016.

[11] Salvanto, Anthony; Backus, Fred; De Pinto, Jennifer; Dutton, Sarah (January 24, 2016). "Poll: Sanders edges Clinton in Iowa, leads big in New Hampshire". CBS News. Retrieved January 24, 2016.

[EmersonTPM-12] Dinan, Conor (21 January 2016). "Emerson Poll: Clinton Ahead Of Sanders In Iowa By 9 Points". Talking Points Memo. Retrieved 22 January 2016.

[13] "Iowa CNN/ORC poll: Full results". cnn.com. 21 January 2016. Retrieved 22 January 2016.

[14] "Iowa Democratic Caucus Poll Prepared for Monmouth College and KBUR-AM" (PDF). Retrieved 22 January 2016.

[15] "Loras College – 2016 – Clinton Maintains Lead, New Loras College Poll Finds". Loras.edu. 2014-12-06. Retrieved 2016-01-23.

[publicpolicypolling2-16] "Iowa Democratic Presidential Caucus" (PDF). Public Policy Polling. Retrieved 2016-01-12.

[17] "Sanders, Clinton Going Down to the Wire, Iowa Poll Shows". Bloomberg. Retrieved 2016-01-14.

[18] "Iowa Democratic Presidential Caucus" (PDF). American Research Group. Retrieved 2016-01-11.

[quinnipiac3-19] "Sander Surges In Iowa Democratic Caucus". Quinnipiac University. Retrieved 2016-01-12.

[20] Brown, S. Kathi (January 2016). "Likely Iowa Caucus Voters' Attitudes toward Social Security". AARP Research. Retrieved 5 February 2016.

[21] "NBC News/WSJ/Marist Poll January 2016 Iowa Questionnaire" (PDF). msnbcmedia.msn.com. Retrieved 2015-01-10.

[gravismarketing.com1-22] "Gravis Iowa Caucus Republican and Democrat Public Opinion Poll". Gravis Marketing. 23 December 2015. Retrieved 22 January 2016.

[cbsnews.com-23] "CBS News 2016 Battleground Tracker Iowa" (PDF).

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