Template:2016 Iowa Democratic presidential caucuses polls
| Poll source | Date | 1st | 2nd | Other |
|---|---|---|---|---|
| Caucus results[1] | February 1, 2016 | Hillary Clinton 49.9% |
Bernie Sanders 49.6% |
Martin O'Malley 0.6% |
| Emerson College[2] 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[3] 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[4] 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[5]
Margin of error ± 3.4%
|
January 26–27, 2016 | Hillary Clinton 48% |
Bernie Sanders 40% |
Martin O'Malley 7% No preference 5% |
| Gravis Marketing[6]
Margin of error ± 3%
|
January 26–27, 2016 | Hillary Clinton 53% |
Bernie Sanders 42% |
Martin O'Malley 5% No preference 0% |
| Monmouth University[7]
Margin of error ± 4.4%
|
January 23–26, 2016 | Hillary Clinton 47% |
Bernie Sanders 42% |
Martin O'Malley 6% Undecided 5% |
| American Research Group[8]
Margin of error ± 5.0%
|
January 21–24, 2016 | Bernie Sanders 48% |
Hillary Clinton 45% |
Martin O'Malley 3% No preference 4% |
| Quinnipiac University[9]
Margin of error: ± 4%
|
January 18–24, 2016 | Bernie Sanders 49% |
Hillary Clinton 45% |
Martin O'Malley 4% Undecided 2% |
| ISU/WHO-HD[10]
Margin of error: ±
|
January 5–22, 2016 | Hillary Clinton 47% |
Bernie Sanders 45% |
Martin O'Malley <1% Undecided 7% |
| Fox News[11]
Margin of error ± 4.5%
|
January 18–21, 2016 | Hillary Clinton 48% |
Bernie Sanders 42% |
Martin O'Malley 3% No preference 7% |
| YouGov/CBS News[12]
Margin of error ± 8.9%
|
January 17–21, 2016 | Bernie Sanders 47% |
Hillary Clinton 46% |
Martin O'Malley 5% No preference 2% |
| Emerson College Polling Society[13]
Margin of error: ± 5.9%
|
January 18–20, 2016 | Hillary Clinton 52% |
Bernie Sanders 43% |
Martin O'Malley 3% Undecided 2% |
| CNN/ORC[14]
Margin of error: ± 6%
|
January 15–20, 2016 | Bernie Sanders 51% |
Hillary Clinton 43% |
Martin O'Malley 4% Undecided 2% |
| Monmouth College/KBUR[15]
Margin of error: ± 4.1%
|
January 18–19, 2016 | Hillary Clinton 47.7% |
Bernie Sanders 39.3% |
Martin O'Malley 7.4% Undecided 5% |
| Loras College[16]
Margin of error: ± 4.4%
|
January 8–10, 2016 | Hillary Clinton 46% |
Bernie Sanders 40% |
Martin O'Malley 8% Undecided 5% |
| Public Policy Polling[17]
Margin of error: ± 4.1%
|
January 8–10, 2016 | Hillary Clinton 46% |
Bernie Sanders 40% |
Martin O'Malley 8% Undecided 5% |
| Bloomberg/DMR[18]
Margin of error: ± 4.4%
|
January 7–10, 2016 | Hillary Clinton 42% |
Bernie Sanders 40% |
Martin O'Malley 4% Other/Undecided 14% |
| American Research Group[19]
Margin of error: ± 4.0%
|
January 6–10, 2016 | Bernie Sanders 47% |
Hillary Clinton 44% |
Martin O'Malley 3% Undecided 5% |
| Quinnipiac University[20]
Margin of error: ± 4.4%
|
January 5–10, 2016 | Bernie Sanders 49% |
Hillary Clinton 44% |
Martin O'Malley 4% Undecided 3% |
| Mason-Dixon/AARP[21]
Margin of error: ±
|
January 4–8, 2016 | Hillary Clinton 49% |
Bernie Sanders 42% |
Martin O’Malley 5% Not Reported 4% |
| NBC News/WSJ/Marist[22]
Margin of error: ± 4.8%
|
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[23]
Margin of error ± 5%
|
December 18–21, 2015 | Hillary Clinton 49% |
Bernie Sanders 31% |
Martin O'Malley 10% Unsure 10% |
| YouGov/CBS News[24]
Margin of error ± 5.3%
|
December 14–17, 2015 | Hillary Clinton 50% |
Bernie Sanders 45% |
Martin O'Malley 4% No preference 1% |
| Public Policy Polling[25]
Margin of error: ± 4.3%
|
December 10–13, 2015 | Hillary Clinton 52% |
Bernie Sanders 34% |
Martin O'Malley 7% Undecided 6% |
| Quinnipiac University[26]
Margin of error: ± 3.6%
|
December 4–13, 2015 | Hillary Clinton 51% |
Bernie Sanders 40% |
Martin O'Malley 6% Undecided 3% |
| Fox News[27]
Margin of error: ± 5.0%
|
December 7–10, 2015 | Hillary Clinton 50% |
Bernie Sanders 36% |
Martin O'Malley 5% Other 4% Undecided 10% |
| Loras College[28]
Margin of error: ± 4.4
|
December 7–10, 2015 | Hillary Clinton 59% |
Bernie Sanders 27% |
Martin O'Malley 4% Undecided 10% |
| Des Moines Register/Bloomberg/Selzer[29]
Margin of error ± 4.9%
|
December 7–10, 2015 | Hillary Clinton 48% |
Bernie Sanders 39% |
Martin O'Malley 4% Undeicded 8% |
| Monmouth[30] Margin of error ± 4.9%
Sample Size: 405 |
December 3–6, 2015 | Hillary Clinton 55% |
Bernie Sanders 33% |
Martin O'Malley 6% |
| CNN/ORC[30] Margin of error ± 4.5%
|
November 28 – December 6, 2015 | Hillary Clinton 54% |
Bernie Sanders 36% |
Martin O'Malley 4% |
| Quinnipiac University[31]
Margin of error ± 4.2%
|
November 16–22, 2015 | Hillary Clinton 51% |
Bernie Sanders 42% |
Martin O'Malley 4% Undecided 3% |
| YouGov/CBS News[32]
Margin of error ± 7.6%
|
November 15–19, 2015 | Hillary Clinton 50% |
Bernie Sanders 44% |
Martin O'Malley 5% Undecided 1% |
| CNN/ORC[33]
Margin of error ± 4.5%
|
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[34]
Margin of error ± 3.0%
|
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[35]
Margin of error ± 3.9%
|
October 30 – November 1, 2015 | Hillary Clinton 57% |
Bernie Sanders 25% |
Martin O'Malley 7% Lawrence Lessig 1% Not Sure 9% |
| KBUR-Monmouth[36]
Margin of error: ± 3.76%
|
October 29–31, 2015 | Hillary Clinton 45.8% |
Bernie Sanders 31.7% |
Martin O'Malley 5.4% Undecided 17.0% |
| Monmouth University[37]
Margin of error ± 3.76%
|
October 29–31, 2015 | Hillary Clinton 45.8% |
Bernie Sanders 31.7% |
Martin O'Malley 5.4% Undecided 17% |
| Monmouth University[38]
Margin of error ± 4.9%
|
October 22–25, 2015 | Hillary Clinton 65% |
Bernie Sanders 24% |
Martin O'Malley 5% Lawrence Lessig 1% Undecided 5% |
| YouGov/CBS News[39]
Margin of error ± 6.9%
|
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[40]
Margin of error ± 4.9%
|
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[41]
Margin of error: ± 5.3%
|
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[42]
Margin of error ± 4.4%
|
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[43]
Margin of error ± 6.6%
|
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[44]
Margin of error: ± 3.4%
|
Posted September 10, 2015 | Bernie Sanders 41% |
Hillary Clinton 40% |
Joe Biden 12% Martin O'Malley 3% |
| NBC News/Marist Poll[45]
Margin of error: ± 5.3%
|
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[46]
Margin of error ± 4.37%
|
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[47]
Margin of error: ± 4.9%
|
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[48]
Margin of error: ± 4.4%
|
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[49]
Margin of error: ± 4.5%
|
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[50]
Margin of error: ± 4.1%
|
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[51]
Margin of error: ± 5.5%
|
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[52]
Margin of error: 3.07%
|
June 27–29, 2015 | Hillary Clinton 63% |
Bernie Sanders 20% |
Martin O'Malley 5% Jim Webb 3% Lincoln Chafee 1% Undecided 8% |
| Quinnipiac University[53]
Margin of error: 3.6%
|
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[54]
Margin of error: 4.9%
|
June 19–22, 2015 | Hillary Clinton 50% |
Bernie Sanders 24% |
Martin O'Malley 2% Lincoln Chafee 0% Undecided 23% |
| Morning Consult[55]
Margin of error: ?
|
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[56]
Margin of error: ± 5.0%
|
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[57]
Margin of error: ± 4.7%
|
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[58]
Margin of error: ± 3.7%
|
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[59]
Margin of error: ± 4.5%
|
April 23–26, 2015 | Hillary Clinton 62% |
Bernie Sanders 14% |
Martin O'Malley 6% Jim Webb 3% Lincoln Chafee 2% Undecided 13% |
| Loras College[60]
Margin of error: ± 4.4%
|
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[61]
Margin of error: ± 3.9%
|
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[62]
Margin of error: ± 5.5%
|
February 3–10, 2015 | Hillary Clinton 68% |
Joe Biden 12% |
Bernie Sanders 7% Jim Webb 1% Martin O'Malley <1% Undecided 12% |
| Selzer & Co.[63]
Margin of error: ± 4.9%
|
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[64]
Margin of error: ± 6.06%
|
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[65]
Margin of error: ± 5%
|
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[66]
Margin of error: ± ?
|
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.[67]
Margin of error: ± 4.8%
|
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[68]
Margin of error: ± 5.5%
|
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[69]
Margin of error: ± 7.09%
|
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[70]
Margin of error: ± 4.2%
|
July 7–13, 2014 | Hillary Clinton 70% |
Joe Biden 20% |
Undecided 10% |
| Vox Populi Polling[71]
Margin of error: ± 6.6%
|
June 4–5, 2014 | Hillary Clinton 65% |
Joe Biden 18% |
Elizabeth Warren 12% Andrew Cuomo 3% Martin O'Malley 2% |
| Public Policy Polling[72]
Margin of error: ±5.2%
|
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[73]
Margin of error: ± 8.4%
|
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[74]
Margin of error: ±5.4%
|
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[75]
Margin of error: ±2.1%
|
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[76]
Margin of error: ±6.1%
|
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[77]
Margin of error: ±5.5%
|
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[78]
Margin of error:
|
January 29, 2013 | Hillary Clinton 65.38% |
Joe Biden 13.74% |
Andrew Cuomo 3.85% Undecided 17.03% |
References
- ^ Caucus results
- ^ "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.
- ^ "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.
- ^ 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.
- ^ "NBC News/WSJ/Marist Poll" (PDF). MSNBC. 28 January 2016. Retrieved 5 February 2016.
- ^ "Iowa Polling Results". OAN. Retrieved 5 February 2016.
- ^ "IOWA: CLINTON CLINGS TO CAUCUS LEAD" (PDF). Monmouth University Poll. 28 January 2016. Retrieved 5 February 2016.
- ^ "Iowa". American Research Group, Inc. Retrieved 5 February 2016.
- ^ "Sanders-Clinton Close Race Frozen In Iowa, Quinnipiac University Poll Finds; Men, Very Liberals, Young Voters Back Sanders". Quinnipiac University. Retrieved 2016-01-27.
- ^ "Clinton, Cruz Lead Among Iowa Caucusgoers in WHO-HD, Iowa State University Poll". WHO TV. 25 January 2016. Retrieved 5 February 2016.
- ^ "Fox News Poll: Sanders narrows gap in Iowa". Fox News. Retrieved 5 February 2016.
- ^ 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.
- ^ Dinan, Conor (21 January 2016). "Emerson Poll: Clinton Ahead Of Sanders In Iowa By 9 Points". Talking Points Memo. Retrieved 22 January 2016.
- ^ "Iowa CNN/ORC poll: Full results". cnn.com. 21 January 2016. Retrieved 22 January 2016.
- ^ "Iowa Democratic Caucus Poll Prepared for Monmouth College and KBUR-AM" (PDF). Retrieved 22 January 2016.
- ^ "Loras College – 2016 – Clinton Maintains Lead, New Loras College Poll Finds". Loras.edu. 2014-12-06. Retrieved 2016-01-23.
- ^ "Iowa Democratic Presidential Caucus" (PDF). Public Policy Polling. Retrieved 2016-01-12.
- ^ "Sanders, Clinton Going Down to the Wire, Iowa Poll Shows". Bloomberg. Retrieved 2016-01-14.
- ^ "Iowa Democratic Presidential Caucus" (PDF). American Research Group. Retrieved 2016-01-11.
- ^ "Sander Surges In Iowa Democratic Caucus". Quinnipiac University. Retrieved 2016-01-12.
- ^ Brown, S. Kathi (January 2016). "Likely Iowa Caucus Voters' Attitudes toward Social Security". AARP Research. Retrieved 5 February 2016.
- ^ "NBC News/WSJ/Marist Poll January 2016 Iowa Questionnaire" (PDF). msnbcmedia.msn.com. Retrieved 2015-01-10.
- ^ "Gravis Iowa Caucus Republican and Democrat Public Opinion Poll". Gravis Marketing. 23 December 2015. Retrieved 22 January 2016.
- ^ "CBS News 2016 Battleground Tracker Iowa" (PDF).
- ^ "Trump Edges Cruz in Iowa; His Supporters Think Japanese Internment Was Good; Clinton Still Well Ahead of Sanders In State". Public Policy Polling. Retrieved 23 December 2015.
- ^ "Iowa (IA) Poll". QU Poll. December 15, 2015. Retrieved 23 December 2015.
- ^ "Fox News Poll: Cruz, Clinton lead in Iowa". Fox News. Retrieved 23 December 2015.
- ^ "Loras College – 2015 – Clinton Remains with Strong Lead, New Loras College Poll Finds". Loras.edu. 2015-12-15. Retrieved 2015-12-27.
- ^ "Bloomberg Politics/Des Moines Register Iowa Poll". Selzer & Company. December 2015. Retrieved 22 January 2016.
- ^ a b "Iowa Democratic Presidential Caucus". realclearpolitics.com. Retrieved 2015-12-09.
- ^ "Iowa (IA) Poll – November 25, 2015 – Clinton Leads Iowa Dem Caucus, | Quinnipiac University Connecticut". Quinnipiac.edu. 2015-11-25. Retrieved 2015-12-27.
- ^ "Election 2016: Hillary Clinton extends Iowa lead, maintains SC lead, narrows gap in NH". 23 November 2015.
- ^ "Iowa" (PDF). CNN/ORC. 6 November 2015. Retrieved 22 January 2016.
- ^ "RCP IA poll" (PDF). November 2, 2015.
- ^ "Cruz rising in Iowa; Clinton back out to dominant lead" (PDF). November 2, 2015.
- ^ "KBUR Dem poll" (PDF).
- ^ "Iowa Democratic Caucus Poll – October, 2015" (PDF). Douglas Fulmer and Associates. October 2015. Retrieved 22 January 2016.
- ^ "Iowa: Clinton has Huge Caucus Lead" (PDF). Monmouth University Poll. 27 October 2015. Retrieved 22 January 2016.
- ^ "CBS News 2016 Battleground Tracker Iowa" (PDF). YouGov. Retrieved 22 January 2016.
- ^ "Iowa Poll: Clinton up by 7, but gap tightens". Des Moines Register. 22 October 2015.
- ^ "NBC News/WSJ/Marist Poll October 2015 Iowa Questionnaire". Retrieved 2015-10-04.
- ^ "Trump Continues To Lead in Iowa; Clinton in Good Shape" (PDF). Public Policy Polling. 22 September 2015. Retrieved 22 January 2016.
- ^ "CBS News 2016 Battleground Tracker Iowa" (PDF). YouGov. Retrieved 22 January 2016.
- ^ "Bernie Sanders Iowa poll". Retrieved 2015-09-10.
- ^ "NBC News/Marist Poll – September 2015 – Iowa Questionnaire". Retrieved 2015-09-06.
- ^ "Clinton Leads but Sanders Gains, Loras College Poll Finds". loras.edu. Retrieved 2015-09-04.
- ^ "Iowa Poll: Clinton leads, but Sanders draws near". Des Moines Register. 29 August 2015.
- ^ "Despite email flap, Clinton up in Iowa in Suffolk poll". USA Today. Retrieved 2015-08-26.
- ^ "CNN/ORC Iowa Poll" (PDF). CNN. Retrieved 2015-08-12.
- ^ "Trump Still Leads in Iowa; Fiorina on Fire; Paul Tanking" (PDF). Public Policy Polling. Retrieved 2015-08-10.
- ^ "Iowa Results" (PDF). NBC News/Marist. Retrieved 2015-07-26.
- ^ "HuffPo Iowa Dem Caucus" (PDF). huffingtonpost.com. Retrieved 2015-07-22.
- ^ "Quinnipiac poll" (PDF). quinnipiac.edu. Retrieved 2015-07-09.
- ^ Bloomberg
- ^ Morning Consult
- ^ Gravis Marketing
- ^ Bloomberg/Des Moines
- ^ Quinnipiac University
- ^ Public Policy Polling
- ^ Loras College
- ^ Quinnipiac
- ^ NBC News/Marist
- ^ Selzer & Co.
- ^ Loras College
- ^ Fox News
- ^ Reuters/Ipsos
- ^ Selzer & Co.
- ^ CNN/ORC
- ^ Suffolk
- ^ NBC News/Marist
- ^ Vox Populi Polling
- ^ Public Policy Polling
- ^ Suffolk
- ^ Public Policy Polling
- ^ Cygnal
- ^ Public Policy Polling
- ^ Public Policy Polling
- ^ Harper Polling