Statewide opinion polling for the April, May, and June Democratic Party presidential primaries, 2008

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This article is a collection of state-wide public opinion polls that have been conducted relating to the April, May, and June Democratic presidential primaries, 2008.

Pennsylvania[edit]

PennsylvaniaPennsylvania winner: Hillary Clinton
Format: Primary see: Pennsylvania Democratic primary, 2008
Date: April 22, 2008
Delegates at stake 188
Delegates won To be determined

Tracking Polls[edit]

Poll source Date Highlights
Newsmax/Zogby Tracking

Latest Sample size: 675 LV
Latest Margin of error: ± 3.8%

April 20–21, 2008 Clinton 51%, Obama 41%, Someone else 3%, Not sure 6%
April 19–20, 2008 Clinton 48%, Obama 42%, Someone else 4%, Not sure 6%
April 18–19, 2008 Clinton 46%, Obama 43%, Someone else 3%, Not sure 8%
April 17–18, 2008 Clinton 47%, Obama 42%, Someone else 3%, Not sure 8%
April 16–17, 2008 Clinton 47%, Obama 43%, Someone else 2%, Not sure 8%
April 15–16, 2008 Clinton 45%, Obama 44%, Someone else 3%, Not sure 9%

Polls[edit]

Poll source Date Highlights
Insider Advantage/Majority Opinion

Sample size: 712 LV
Margin of error: ± 3.6%

April 21, 2008 Clinton 49%, Obama 42%, Not Sure 9%
Newsmax/Zogby

Sample size: 675 LV
Margin of error: ± 4%

April 20–21, 2008 Clinton 51%, Obama 41%, Someone else 3%, Not sure 6%
American Research Group

Sample size: 600
Margin of error: ± 4%

April 20–21, 2008 Clinton 56%, Obama 40%, Other 1%, Undecided 3%
Insider Advantage/Majority Opinion

Sample size: 747 LV
Margin of error: ± 3.4%

April 20, 2008 Clinton 49%, Obama 39%, Not Sure 12%
Rasmussen Reports

Sample size: 722 LV
Margin of error: ± 4%

April 20, 2008 Clinton 49%, Obama 44%, Not Sure 7%
Public Policy Polling

Sample size: 2,338 LV
Margin of error: ± 2%

April 19–20, 2008 Obama 49%, Clinton 46%, Undecided 5%
Newsmax/Zogby

Sample size: 602 LV
Margin of error: ± 4.1%

April 19–20, 2008 Clinton 48%, Obama 42%, Someone else 4%, Not sure 6%
Suffolk University

Sample size: 600 LV
Margin of error: ± 4%

April 19–20, 2008 Clinton 52%, Obama 42%, Undecided 4%, Refused a response 2%
SurveyUSA

Sample size: 710 LV
Margin of error: ± 3.8%

April 18–20, 2008 Clinton 50%, Obama 44%, Other 4%, Undecided 2%
Quinnipiac University

Sample size: 1,027 LV
Margin of error: ± 3.1%

April 18–20, 2008 Clinton 51%, Obama 44%, Other 1%, Undecided 4%
Strategic Vision

Sample size: 1,200 LV
Margin of error: ± 3%

April 18–20, 2008 Clinton 48%, Obama 41%, Undecided 11%
Newsmax/Zogby

Sample size: 607 LV
Margin of error: ± 4.1%

April 18–19, 2008 Clinton 46%, Obama 43%, Someone else 3%, Not sure 8%
American Research Group

Sample size: 600
Margin of error: ± 4%

April 17–19, 2008 Clinton 54%, Obama 41%, Other 1%, Undecided 4%
MSNBC/McClatchy/Mason-Dixon

Sample size: 625 LV
Margin of error: ± 4%

April 17–18, 2008 Clinton 48%, Obama 43%, Undecided 8%
Newsmax/Zogby

Sample size: 608 LV
Margin of error: ± 4.1%

April 17–18, 2008 Clinton 47%, Obama 42%, Someone else 3%, Not sure 8%
Rasmussen Reports

Sample size: 730 LV
Margin of error: ± 4%

April 17, 2008 Clinton 47%, Obama 44%, 9% Undecided
Newsmax/Zogby

Sample size: 602 LV
Margin of error: ± 4.1%

April 16–17, 2008 Clinton 47%, Obama 43%, Someone else 2%, Not sure 8%
Muhlenberg College

Sample size: 322
Margin of error: ±5.5%

April 10–17, 2008 Clinton 47%, Obama 46%, Undecided 7%
Newsmax/Zogby

Sample size: 601 LV
Margin of error: ± 4.1%

April 15–16, 2008 Clinton 45%, Obama 44%, Someone else 3%, Not sure 9%
Public Policy Polling

Sample size: 1,095
Margin of error: ± 3%

April 14–15, 2008 Obama 45%, Clinton 42%, Undecided 13%
Rasmussen Reports

Sample size: 741
Margin of error: ± 4%

April 14, 2008 Clinton 50%, Obama 41%, Undecided 9%
SurveyUSA

Sample size: 638
Margin of error: ± 3.9%

April 12–14, 2008 Clinton 54%, Obama 40%, Other 3%, Undecided 3%
Los Angeles Times/Bloomberg

Sample size: 623
Margin of error: ± 4%

April 10–14, 2008 Clinton 46%, Obama 41%, Other 1%, Undecided 12%
Strategic Vision

Sample size: 1200
Margin of error: ± 3%

April 11–13, 2008 Clinton 49%, Obama 40%, Other/Undecided 11%
American Research Group

Sample size: 600
Margin of error: ± 4%

April 11–13, 2008 Clinton 57%, Obama 37%, Other 2%, Undecided 4%
Quinnipiac University

Sample size: 2,103
Margin of error: ± 2.1%

April 9–13, 2008 Clinton 50%, Obama 44%, Undecided 6%
Franklin & Marshall College

Sample size: 367
Margin of error: ±5.1%

April 8–13, 2008 Clinton 46%, Obama 40%, Undecided 14%
Newsmax/Zogby

Sample size: 1,002
Margin of error: ± 3.2%

April 9–10, 2008 Clinton 47%, Obama 43%, Undecided 10%
Susquehanna Polling

Sample Size: 500 LV
Margin of Error: ± 4.3%

April 6–10, 2008 Clinton 40%, Obama 37%, Undecided 18%, Other 4%
Temple University

Sample size: 583
Margin of error: ± 4%

March 27 – April 9, 2008 Clinton 47%, Obama 41%, Undecided 11%
InsiderAdvantage

Sample size: 681
Margin of error: ± 3.6%

April 8, 2008 Clinton 48%, Obama 38%, Undecided 13%
Public Policy Polling

Sample size: 1,124
Margin of error: ± 2.9%

April 7–8, 2008 Clinton 46%, Obama 43%, Undecided 11%
Rasmussen Reports

Sample size: 695
Margin of error: ± 4%

April 7, 2008 Clinton 48%, Obama 43%, Undecided 9%
SurveyUSA

Sample size: 597
Margin of error: ± 4.1%

April 5–7, 2008 Clinton 56%, Obama 38%, Other 4%, Undecided 2%
American Research Group

Sample size: 600
Margin of error: ± 4%

April 5–6, 2008 Clinton 45%, Obama 45%, Other 4%, Undecided 6%
Strategic Vision April 4–6, 2008 Clinton 47%, Obama 42%, Undecided 11%
Quinnipiac University

Sample size: 1,340
Margin of error: ± 2.7%

April 3–6, 2008 Clinton 50%, Obama 44%, Other 1%, Undecided 6%
Time Magazine

Sample size: 676

April 2–6, 2008 Clinton 44%, Obama 38%, Undecided 18%
Insider Advantage/Majority Opinion

Sample size: 659

April 3, 2008 Clinton 45%, Obama 42%, Undecided 12%
Muhlenberg College

Sample size: 406
Margin of error: ±5%

March 27 – April 2, 2008 Clinton 49%, Obama 38%, Other 2%, Undecided 11%
Public Policy Polling

Sample size: 1,224
Margin of error: ± 2.8%

March 31 – April 1, 2008 Obama 45%, Clinton 43%, Undecided 13%
Rasmussen Reports

Sample size: 730
Margin of error: ± 4%

March 31, 2008 Clinton 47%, Obama 42%, Undecided 11%
Quinnipiac University

Sample size: 1,549
Margin of error: ± 2.5%

March 24–31, 2008 Clinton 50%, Obama 41%, Other 1%, Undecided 8%
Survey USA

Sample size: 588
Margin of error: ± 4,1%

March 29–31, 2008 Clinton 53%, Obama 41%, Someone else 4%, Undecided 2%
Strategic Vision

Sampling Size: 504

March 28–30, 2008 Clinton 49%, Obama 41%, Undecided 10%
American Research Group

Sample size: 600
Margin of error: ± 4%

March 26–27, 2008 Clinton 51%, Obama 39%, Other 2%, Undecided 8%
Rasmussen Reports

Sample size: 690
Margin of error: ± 4%

March 24, 2008 Clinton 49%, Obama 39%, Undecided 12%
Public Policy Polling

Sample size: 597
Margin of error: ± 4%

March 15–16, 2008 Clinton 56%, Obama 30%, Undecided 14%
Quinnipiac University

Sample size: 1,304
Margin of error: ± 2.7%

March 10–16, 2008 Clinton 53%, Obama 41%, Other 1%, Undecided 6%
Franklin & Marshall College

Sample size: 294
Margin of error: ±5.7%

March 11–16, 2008 Clinton 51%, Obama 35%, Other 1%, Undecided 13%
Rasmussen Reports

Sample size: 697
Margin of error: ± 4%

March 12, 2008 Clinton 51%, Obama 38%, Undecided 11%
Survey USA

Sample size: 608
Margin of error: ± 4%

March 8–10, 2008 Clinton 55%, Obama 36%, Someone else 5%, Undecided 3%
Susquehanna Polling

Sample size: 500

March 5–10, 2008 Clinton 45%, Obama 31%, Someone else 4%, Undecided 20%
Strategic Vision

Sample size: 1,200
Margin of error: ±3%

March 7–9, 2008 Clinton 56%, Obama 38%, Undecided 6%
American Research Group

Sample size: 600
Margin of error: ± 4%

March 7–8, 2008 Clinton 52%, Obama 41%, Someone else 1%, Undecided 6%
Rasmussen Reports

Sample size: 690
Margin of error: ± 4%

March 5, 2008 Clinton 52%, Obama 37%, Undecided 11%
Rasmussen Reports

Sample size: 820
Margin of error: ± 3%

February 26, 2008 Clinton 46%, Obama 42%, Undecided 12%
Quinnipiac University

Sample size: 506 LV
Margin of error: ±4.4%

February 21–25, 2008 Clinton 49%, Obama 43%, Other 1%, Undecided 7%
Franklin & Marshall College

Sample size: 303
Margin of error: ±5.6%

February 13–18, 2008 Clinton 44%, Obama 32%, Other 4%, Undecided 20%
Quinnipiac University

Sample size: 577 LV
Margin of error: ±4.1%

February 6–12, 2008 Clinton 52%, Obama 36%, Other 1%, Undecided 11%
Franklin & Marshall College

Sample size: 627
Margin of error: ±3.9%

January 8–14, 2008 Clinton 40%, Obama 20%, Edwards 11%, Other 6%, Undecided 23%
Quinnipiac University

Sample size: 462
Margin of error: ± 4.6%

November 23 – December 3, 2007 Clinton 43%, Obama 15%, Edwards 9%, Biden 5%, Kucinich 3%, Richardson 2%, Dodd 1%, Gravel -, Other 2%, undecided 18%
Quinnipiac University October 31 – November 5, 2007 Clinton 48%, Obama 15%, Edwards 11%, Biden 3%, Richardson 2%, Kucinich 1%, Dodd -, Gravel -, Other 1%, undecided 15%
Quinnipiac University October 1–8, 2007 Clinton 41%, Obama 14%, Edwards 11%, Biden 5%, Richardson 3%, Kucinich 3%, Dodd -, Gravel -, Other 2%, undecided 18%
Strategic Vision September 28–30, 2007 Clinton 42%, Obama 24%, Edwards 9%, Richardson 6%, Biden 5%, Dodd 1%, Kucinich 1%, undecided 12%
Pennsylvania Keystone Poll August 24 – September 2, 2007 Clinton 38%, Obama 21%, Edwards 17%, Other 6%, Don't Know 18%
Quinnipiac University 14–20 August 2007 Clinton 42%, Gore 13%, Obama 12%, Edwards 8%, Biden 4%, Richardson 1%, Kucinich 1%, Dodd -, Gravel -, Other 2%, undecided 16%
Quinnipiac University July 30–6 August 2007 Clinton 35%, Obama 19%, Gore 12%, Edwards 10%, Biden 2%, Richardson 2%, Kucinich 1%, Dodd -, Gravel -, Other 2%, undecided 15%
Strategic Vision (R) July 6–8, 2007 Clinton 36%, Obama 25%, Edwards 12%, Richardson 8%, Biden 5%, Dodd 1%, Kucinich 1%, undecided 12%
Quinnipiac (without Gore) June 22–28, 2007 Clinton 38%, Obama 22%, Edwards 10%, Biden 6%, Richardson 2%, Dodd 1%, Kucinich 1%, Gravel -, Other 2%, undecided 15%
Quinnipiac (with Gore) June 22–28, 2007 Clinton 32%, Obama 18%, Gore 16%, Edwards 7%, Biden 5%, Richardson 2%, Dodd 1%, Kucinich 1%, Gravel -, Other 2%, undecided 15%
WTAE/Pittsburgh Tribune-Review Keystone May 29 – June 4, 2007 Clinton 40%, Edwards 21%, Obama 18%, Other 3%, Unsure 18%
Quinnipiac University May 22–28, 2007 Clinton 33%, Gore 16%, Obama 13%, Edwards 11%, Biden 3%, Richardson 3%, Kucinich 1%, Wesley Clark -, Dodd -, Gravel -, Other 4%, Unsure 16%
Strategic Vision (R) 13–15 April 2007 Clinton 33%, Obama 23%, Edwards 19%, Biden 3%, Richardson 3%, Dodd 1%, Kucinich 1%, undecided 17%
Quinnipiac University (without Gore) 19–25 March 2007 Clinton 38%, Obama 24%, Edwards 16%, Biden 6%, Richardson 3%, Clark 0%, Dodd 0%, Gravel 0%, Kucinich 0%, Other 1%, Unsure 11%
Quinnipiac University 19–25 March 2007 Clinton 36%, Obama 17%, Gore 13%, Edwards 9%, Biden 4%, Richardson 2%, Clark 0%, Dodd 0%, Gravel 0%, Kucinich 0%, Other 2%, Unsure 16%
Strategic Vision 16–18 March 2007 Clinton 35%, Obama 25%, Edwards 13%, Clark 2%, Biden 3%, Dodd 1%, Kucinich 1%, Richardson 2%, undecided 18%
Quinnipiac University 1–5 February 2007 Clinton 37%, Obama 11%, Edwards 11%, Gore 11%, Biden 5%, Dodd 1%, Kucinich 1%, Richardson 1%, Vilsack 1%, Someone Else 2%, Wouldn't Vote 2%, undecided 17%
American Research Group 16–22 January 2007 Clinton 32%, Obama 13%, Edwards 12%, Biden 8%, Clark 6%, Dodd 2%, Kerry 2%, Kucinich 2%, Gravel 1%, Richardson 1%, Vilsack 1%, undecided 21%

Indiana[edit]

Indiana Indiana winner: Hillary Clinton
Format: Primary see: Indiana Democratic primary, 2008
Date: 6 May 2008
Delegates at stake 72
Delegates won To be determined

The sample set for some polls in this table is not unique and overlaps with polls from previous days. These polls are marked as Tracking Polls.

Poll source Date Highlights
Zogby International

Sample Size: 644 (Tracking)
Margin of Error: ± 3.9%

May 4–5, 2008 Obama 45%, Clinton 43%, Someone else 5%, Undecided 7%
see Indiana Tracking Polls for earlier results
Insider Advantage/Majority Opinion

Sample size: 502
Margin of error: ± 4%

May 4, 2008 Clinton 48%, Obama 44%, Undecided 8%
Public Policy Polling

Sample Size: 851 LV
Margin of Error ± 3.4%

May 3–4, 2008 Clinton 49%, Obama 44%, Undecided 7%
Suffolk University

Sample Size: 600 LV
Margin of Error ± 4%

May 3–4, 2008 Clinton 49%, Obama 43%, Undecided 6%, No Response 2%
Survey USA

Sample Size: 675 LV
Margin of Error ± 3.8%

May 2–4, 2008 Clinton 54%, Obama 42%, Undecided 2%, No Response 1%
American Research Group

Sample Size: 600 LV
Margin of Error ± 4%

May 2–4, 2008 Clinton 53%, Obama 45%, Undecided 2%
American Research Group

Sample size: 600 LV
Margin of error: ± 4%

April 30 – May 1, 2008 Clinton 53%, Obama 44%, Undecided 3%
Insider Advantage/Majority Opinion

Sample size: 478
Margin of error: ± 4%

April 30 – May 1, 2008 Clinton 47%, Obama 40%, Undecided 13%
Downs Center/SurveyUSA

Sample size: 689
Margin of error: ± 3.8%

April 28–30, 2008 Clinton 52%, Obama 45%, Undecided 5%
Rasmussen Reports

Sample size: 400
Margin of error: ±5%

April 29, 2008 Clinton 46%, Obama 41%, Undecided 13%
TeleResearch Corp

Sample size: 943
Margin of error: ±3.3%

April 25–29, 2008 Clinton 48%, Obama 38%, Undecided 14%
Public Policy Polling

Sample size: 1,388
Margin of error: ±2.6%

April 26–27, 2008 Clinton 50%, Obama 42%, Undecided 8%
SurveyUSA

Sample size: 628
Margin of error: ±4%

April 25–27, 2008 Clinton 52%, Obama 43%, Other 3%, Undecided 2%
Howey-Gauge

Sample size: 600 LV
Margin of error: ± 4.1%

April 23–24, 2008 Obama 47%, Clinton 45%, Undecided 8%
American Research Group

Sample size: 600 LV
Margin of error: ± 4%

April 23–24, 2008 Clinton 50%, Obama 45%, Undecided 5%
Research 2000/South Bend Tribune

Sample size: 400 LV
Margin of error: ± 5%

April 23–24, 2008 Obama 48%, Clinton 47%, Undecided 2%
Selzer & Co./Indianapolis Star/WTHR

Sample size: 534 LV
Margin of error: ± 4.2%

April 20–23, 2008 Obama 41%, Clinton 38%, Undecided 21%
Downs Center/SurveyUSA

Sample size: 578
Margin of error: ±4.2%

April 14–16, 2008 Obama 50%, Clinton 45%, Undecided 5%
Los Angeles Times/Bloomberg

Sample size: 687
Margin of error: ±4%

April 10–14, 2008 Obama 40%, Clinton 35%, Other 6%, Unsure 19%
SurveyUSA

Sample size: 571
Margin of error: ±4.2%

April 11–13, 2008 Clinton 55%, Obama 39%, Other 3%, Undecided 3%
American Research Group

Sample size: 600 LV
Margin of error: ±4%

April 2–3, 2008 Clinton 53%, Obama 44%, Other 1%, Undecided 2%
Research 2000

Sample size: 400
Margin of error: ±5%

March 31 – April 2, 2008 Clinton 49%, Obama 46%, Other 3%, Undecided 2%
Survey USA

Sample size: 530
Margin of error: ±4.3%

March 29–31, 2008 Clinton 52%, Obama 43%, Other 4%, Undecided 1%
Howey-Gauge

Sample size: 500
Margin of error: ±4.5%

February 18–21, 2008 Obama 40%, Clinton 25%, Unsure 35%

Indiana Tracking polls[edit]

Poll source Date Highlights
Zogby International May 4–5, 2008
Sample Size: 644
Margin of Error: ±3.9%
Obama 45%, Clinton 43%, Someone else 5%, Undecided 7%
May 3–4, 2008
Sample Size: 636
Margin of Error: ± 4%
Obama 44%, Clinton 42%, Someone else 7%, Undecided 8%
May 2–3, 2008
Sample Size: 595
Margin of Error: ± 4.1%
Obama 43%, Clinton 41%, Someone else 8%, Undecided 8%
May 1–2, 2008
Sample Size: 629
Margin of Error: ± 4%
Obama 43%, Clinton 42%, Someone else 7%, Undecided 8%
April 30 – May 1, 2008
Sample Size: 680
Margin of Error: ±3.8%
Clinton 42%, Obama 42%, Someone else 7%, Undecided 9%

North Carolina[edit]

North Carolina: Barack Obama
Format: Primary see: North Carolina Democratic primary, 2008
Date: 6 May 2008
Delegates at stake 115
Delegates won To be determined

The sample set for some polls in this table is not unique and overlaps with polls from previous days. These polls are marked as Tracking Polls.

Poll source Date Highlights
Insider Advantage/Majority Opinion

Sample size: 774 LV
Margin of error: ± 3%

May 5, 2008 Obama 47%, Clinton 43%, Undecided 10%
Zogby International

Sample Size: 643 LV(Tracking)
Margin of error: ± 3.9%

May 4–5, 2008 Obama 51%, Clinton 37%, Someone else 4%, Undecided 8%
see North Carolina Tracking Polls for earlier results
Insider Advantage/Majority Opinion

Sample size: 781 LV
Margin of error: ± 3%

May 4, 2008 Obama 48%, Clinton 45%, Undecided 7%
Public Policy Polling

Sample size: 870 LV
Margin of error: ± 3.3%

May 3–4, 2008 Obama 52%, Clinton 42%, Undecided 7%
Survey USA

Sample size: 810 LV
Margin of error: ± 3.5%

May 2–4, 2008 Obama 50%, Clinton 45%, Someone else 3%, Undecided 2%
American Research Group

Sample size: 600 LV
Margin of error: ± 4%

May 2–4, 2008 Obama 50%, Clinton 42%, Someone else 4%, Undecided 4%
Rasmussen Reports

Sample size: 831
Margin of error: ±4

May 1, 2008 Obama 49%, Clinton 40%, Undecided 11%
Insider Advantage/Majority Opinion

Sample size: 611
Margin of error: ±3.8%

May 1, 2008 Obama 49%, Clinton 44%, Undecided 7%
American Research Group

Sample size: 600
Margin of error: ±4%

April 30 – May 1, 2008 Obama 52%, Clinton 41%, Someone else 2%, Undecided 5%
Research 2000

Sample size: 500
Margin of error: ± 4.5%

April 29–30, 2008 Obama 51%, Clinton 44%, Other 2%, Undecided 3%
Insider Advantage/Majority Opinion

Sample size: 571
Margin of error: ±3.8

April 29, 2008 Clinton 44%, Obama 42%, Undecided 14%
Mason Dixon/WRAL

Sample size: 400
Margin of error: ±5%

April 28–29, 2008 Obama 49%, Clinton 42%, Other/Undecided 9%
Rasmussen Reports

Sample size: 774
Margin of error: ±4

April 28, 2008 Obama 51%, Clinton 37%, Undecided 12%
Survey USA

Sample size: 727
Margin of error: ±3.7%

April 26–28, 2008 Obama 49%, Clinton 44%, Other 4%, Undecided 3%
Public Policy Polling

Sample size: 1,121
Margin of error: ±2.9%

April 26–27, 2008 Obama 51%, Clinton 39%, Undecided 10%
American Research Group

Sample size: 600
Margin of error: ±4

April 26–27, 2008 Obama 52%, Clinton 42%, Someone else 2%, Undecided 4%
Survey USA

Sample size: 734
Margin of error: ±3.7%

April 19–21, 2008 Obama 50%, Clinton 41%, Other 5%, Undecided 5%
Public Policy Polling

Sample size: 962
Margin of error: ±3.2%

April 19–20, 2008 Obama 57%, Clinton 32%, Undecided 11%
American Research Group

Sample size: 600
Margin of error: ±4

April 14–15, 2008 Obama 52%, Clinton 41%, Someone else 2%, Undecided 5%
Insider Advantage/Majority Opinion

Sample size: 541
Margin of error: ±4%

April 14, 2008 Obama 51%, Clinton 36%, Undecided 13%
Los Angeles Times/Bloomberg

Sample size: 691
Margin of error: ±4%

April 10–14, 2008 Obama 47%, Clinton 34%, Other 2%, Undecided 17%
Public Policy Polling

Sample size: 538
Margin of error: ±4.2%

April 12–13, 2008 Obama 54%, Clinton 34%, Undecided 13%
Citivas Institute/TelOpinion Research

Sample size: 800
Margin of error: ±3.7%

April 9–10, 2008 Obama 45%, Clinton 27%, Undecided 28%
Survey USA

Sample size: 725
Margin of error: ±3.7%

April 5–7, 2008 Obama 49%, Clinton 39%, Other 7%, Undecided 5%
Public Policy Polling

Sample size: 928
Margin of error: ±3.2%

April 5–6, 2008 Obama 54%, Clinton 33%, Undecided 13%
Rasmussen Reports

Sample size: 704
Margin of error: ±4%

April 3, 2008 Obama 56%, Clinton 33%, Undecided 11%
Charlotte Observer

Sample size: 400

March 29 – April 1, 2008 Obama 35%, Clinton 26%, Undecided 39%
Public Policy Polling

Sample size: 1,100
Margin of error: ± 3%

March 29–30, 2008 Obama 54%, Clinton 36%, Undecided 9%
American Research Group

Sample size: 600
Margin of error: ±4%

March 29–30, 2008 Obama 51%, Clinton 38%, Other 4%, Undecided 7%
Insider Advantage/Majority Opinion

Sample size: 460

March 27, 2008 Obama 49%, Clinton 34%, Undecided 17%
Public Policy Polling

Sample size: 673
Margin of error: ±3.8%

March 24, 2008 Obama 55%, Clinton 34%, Undecided 11%
Public Policy Polling

Sample size: 521
Margin of error: ±4.3%

March 17, 2008 Obama 44%, Clinton 43%, Undecided 13%
Survey USA

Sample size: 713
Margin of error: ±3.7%

March 8–10, 2008 Obama 49%, Clinton 41%, Other 6%, Undecided 4%
Rasmussen Reports

Sample size: 716
Margin of error: ±4%

March 6, 2008 Obama 47%, Clinton 40%, Undecided 14%
Public Policy Polling

Sample size: 508 LV
Margin of error: ±4.3%

March 3, 2008 Obama 47%, Clinton 43%, Undecided 10%
Civitas Institute/Tel Opinion Research (R)

Sample size: 800
Margin of error: ±5.7%

February 19–22, 2008 Obama 38%, Clinton 24%, Undecided 38%
Elon University

Sample size: 307
Margin of error: ±5.7%

February 18–21, 2008 Obama 45%, Clinton 31%, Undecided 22%
SurveyUSA

Sample size: 580
Margin of error: ± 4.2%

February 11, 2008 Obama 50%, Clinton 40%, Other 5%, Undecided 4%
Public Policy Polling (D)

Sample size: 676
Margin of error: ± 3.7%

December 3, 2007 Clinton 31%, Edwards 26%, Obama 24%, Other 12%, undecided 8%
SurveyUSA November 2–5, 2007 Clinton 43%, Edwards 25%, Obama 19%, Other 9%, undecided 5%
Public Policy Polling (D) November 5, 2007 Edwards 30%, Clinton 30%, Obama 21%, Other 12%, undecided 8%
Civitas Institute October 9–14, 2007 Clinton 31%, Obama 18%, Edwards 18%, Other 13%, undecided 19%
Public Policy Polling (D) October 3, 2007 Clinton 32%, Edwards 31%, Obama 20%, Other 10%, undecided 7%
Elon University Polling September 24–27, 2007 Clinton 37.4%, Edwards 18.0%, Obama 17.7% Biden 3.7%, Richardson 1.3%, Kucinich 0.5%, Other 0.4%, undecided 21.1%
Public Policy Polling (D) September 5, 2007 Clinton 30%, Edwards 28%, Obama 21%, Other 12%, undecided 10%
Public Policy Polling (D) August 1–2, 2007 Clinton 29%, Edwards 29%, Obama 23% Other 10%, undecided 8%
Public Policy Polling (D) July 2, 2007 Clinton 27%, Obama 27%, Edwards 26%, Other 10%, undecided 11%
Civitas Institute June, 2007 Edwards 25%, Clinton 20%, Obama 18%, Other 12%, undecided 25%
Public Policy Polling (D) June 4, 2007 Edwards 30%, Clinton 26%, Obama 22%, Other 11%, undecided 11%
Public Policy Polling (D) May 1–3, 2007 Edwards 33%, Clinton 27%, Obama 20%, Other 10%, undecided 10%
Public Policy Polling (D) April 2, 2007 Edwards 39%, Clinton 25%, Obama 20%, Other 8%, undecided 9%
Public Policy Polling (D) 5 March 2007 Edwards 29%, Obama 25%, Clinton 21%, Other 13%, undecided 12%
American Research Group 4–7 January 2007 Edwards 30%, Clinton 26%, Obama 19%, Kucinich 3%, Dodd 2%, Richardson 2%, Biden 1%, Kerry 1%, undecided 15%

North Carolina Tracking polls[edit]

Poll source Date Highlights
Zogby Tracking May 4–5, 2008
Sample Size: 643 LV
Margin of error: ± 3.9%
Obama 51%, Clinton 37%, Someone else 4%, Undecided 8%
May 3–4, 2008
Sample Size: 624
Margin of Error: ± 4%
Obama 48%, Clinton 40%, Someone else 5%, Undecided 8%
May 2–3, 2008
Sample Size: 600
Margin of Error: ± 4.1%
Obama 48%, Clinton 39%, Someone else 5%, Undecided 8%
May 1–2, 2008
Sample Size: 627
Margin of Error: ± 4%
Obama 46%, Clinton 37%, Someone else 8%, Undecided 9%
April 30 – May 1, 2008
Sample Size: 668
Margin of Error: ±3.9%
Obama 50%, Clinton 34%, Someone else 8%, Undecided 8%

West Virginia[edit]

West Virginia West Virginia winner: Hillary Clinton
Format: Primary see: West Virginia Democratic primary, 2008
Date: May 13, 2008
Delegates at stake 28
Delegates won To be determined

Poll source Date Highlights
Suffolk University

Sampling Size: 600
Margin of error: ± 4%

May 10–11, 2008 Clinton 60%, Obama 24%, Other 6%, Undecided 10%
American Research Group

Sampling Size: 600
Margin of error: ± 4%

May 7–8, 2008 Clinton 66%, Obama 23%, Other 5%, Undecided 6%
Rasmussen Reports

Sampling Size: 840
Margin of error: ± 3.5%

May 4, 2008 Clinton 56%, Obama 27%, Undecided 17%
TSG Consulting/Orion Strategies

Sampling Size: 300
Margin of error: ± 6%

May 3, 2008 Clinton 63%, Obama 23%, Undecided 14%
Rasmussen Reports

Sampling Size: 702
Margin of error: ±4%

March 13, 2008 Clinton 55%, Obama 27%, Undecided 18%
Charleston Daily Mail February 26, 2008 Clinton 43%, Obama 22%, Undecided 35%
American Research Group March 29 – April 2, 2007 Clinton 37%, Obama 22%, Edwards 19%, Biden 3%, Clark 2%, Kucinich 2%, Richardson 2%, Dodd 1%, Gravel 0%, undecided 13%

Kentucky[edit]

Kentucky Kentucky winner: Hillary Clinton
Format: Primary see: Kentucky Democratic primary, 2008
Date: 20 May 2008
Delegates at stake 51
Delegates won To be determined

Poll source Date Highlights
Suffolk

Sample size: 600
Margin of error: ± 4%

May 17–18, 2008 Clinton 51%, Obama 25%, Edwards 6%, Uncommitted 5%, Undecided 11%
Survey USA

Sample size: 629
Margin of error: ± 3.9%

May 16–18, 2008 Clinton 62%, Obama 31%, Other 5%, Undecided 1%
American Research Group

Sample size: 600
Margin of error: ± 4%

May 14–15, 2008 Clinton 65%, Obama 29%, Other 4%, Unsure 2%
Survey USA

Sample size: 641
Margin of error: ± 3.8%

May 9–11, 2008 Clinton 62%, Obama 30%, Other 6%, Unsure 3%
Mason Dixon/Lexington Herald-Leader/WKYT

Sample size: 500
Margin of error: ± 4.5%

May 7–9, 2008 Clinton 58%, Obama 31%, Unsure 11%
Rasmussen Reports

Sample size: 800
Margin of error: ±4%

May 5, 2008 Clinton 56%, Obama 31%, Unsure 13%
Survey USA

Sample size: 595
Margin of error: ±4%

May 3–5, 2008 Clinton 62%, Obama 28%, Other 8%, Unsure 2%
Survey USA

Sample size: 555
Margin of error: ±4.1%

April 26–28, 2008 Clinton 63%, Obama 27%, Other 7%, Unsure 3%
Survey USA

Sample size: 557
Margin of error: ±4.1%

April 12–14, 2008 Clinton 62%, Obama 26%, Other 9%, Unsure 4%
Survey USA

Sample size: 572
Margin of error: ±4.1%

March 28–30, 2008 Clinton 58%, Obama 29%, Other 10%, Unsure 4%

Oregon[edit]

Oregon Oregon winner: Barack Obama
Format: Mail-only Primary see: Oregon Democratic primary, 2008
Dates: May 2–20, 2008
Delegates at stake 52
Delegates won To be determined

Poll source Date Highlights
Public Policy Polling

Sampling Size: 1,296
Margin of error: ± 2.7%

May 17–18, 2008 Obama 56%, Clinton 38%, Undecided 7%
Suffolk

Sample size: 600
Margin of error: ± 4%

May 17–18, 2008 Obama 45%, Clinton 41%, Undecided 8%, Refused 6%
Survey USA

Sampling Size: 627
Margin of error: ± 4%

May 16–18, 2008 Obama 55%, Clinton 42%, Other 2%, Undecided 1%
American Research Group

Sample size: 600
Margin of error: ± 4%

May 14–15, 2008 Obama 50%, Clinton 45%, Undecided 5%
Public Policy Polling

Sampling Size: 949
Margin of error: ± 3.2%

May 10–11, 2008 Obama 53%, Clinton 39%, Undecided 7%
Survey USA

Sampling Size: 615
Margin of error: ± 4%

May 9–11, 2008 Obama 54%, Clinton 43%, Other 2%, Undecided 2%
Davis, Hibbitts and Midghall/Portland Tribune

Sampling Size: 400
Margin of error: ± 4.8%

May 8–10, 2008 Obama 55%, Clinton 35%, Other/Undecided 10%
Rasmussen Reports

Sampling Size: 867
Margin of error: ± 3%

May 1, 2008 Obama 51%, Clinton 39%, Undecided 10%
Survey USA

Sampling Size: 650
Margin of error: ± 3.9%

April 28–30, 2008 Obama 50%, Clinton 44%, other 2%, undecided 4%
Survey USA

Sampling Size: 597
Margin of error: ± 4.1%

April 4–6, 2008 Obama 52%, Clinton 42%, other 4%, undecided 3%
Riley Research Poll

Sampling Size: 427
Margin of error: ± 4.74%

January 21–29, 2008 Clinton 36%, Obama 28%, Edwards 14%, other 4%, undecided 13%
Riley Research Poll August 10–15, 2007 Clinton 26%, Obama 18%, Edwards 17%, Kucinich 2%, Biden 2%
Riley Research Poll March 5–13, 2007 Clinton 31%, Obama 21%, Edwards 8%, Gore 4%, Richardson 2%

Puerto Rico[edit]

Puerto Rico Puerto Rico winner: Hillary Clinton
Format: Primary see: Puerto Rico Democratic primary, 2008
Date: June 1, 2008
Delegates at stake 55
Delegates won To be determined

Poll source Date Highlights
Vocero/Univision Puerto Rico

Sample size: 300LV Margin of error: ± 3.4%

May 8–20, 2008 Clinton 59%, Obama 40%, Undecided 1%
El Vocero/Univision/
Greenberg, Quinlan, Rosner

Sample size: 800
Margin of error: ± 3.4%

May 8–20, 2008 Clinton 51%, Obama 38%, Undecided 11%
Research & Research

Sample size: 800
Margin of error: ± 4.4%

March 31 – April 5, 2008 Clinton 50%, Obama 37%, Undecided 13%

South Dakota[edit]

South Dakota South Dakota winner: Hillary Clinton
Format: Primary see: South Dakota Democratic primary, 2008
Date: June 3, 2008
Delegates at stake 15
Delegates won To be determined

Poll source Date Highlights
American Research Group

Sample size: 600
Margin of error: ±4 %

May 31 – June 1, 2008 Clinton 60%, Obama 34%, Undecided 6%
Dakota Wesleyan University

Sample size:527
Margin of error: ±4 %

April 3, 2008 Obama 46%, Clinton 34%, Undecided 10%, No One 6%, Other 4%

Montana[edit]

Montana Montana winner: Barack Obama
Format: Primary see: Montana Democratic primary, 2008
Date: June 3, 2008
Delegates at stake 16
Delegates won To be determined

Poll source Date Highlights
American Research Group

Sample size: 600
Margin of error: ± 4%

May 31 – June 1, 2008 Obama 48%, Clinton 44%, Undecided 8%
Mason-Dixon

Sample size: 625
Margin of error: ± 5%

May 19–21, 2008 Obama 52%, Clinton 35%, Undecided 13%
Mason-Dixon December 17–19, 2007 Clinton 29%, Edwards 19%, Obama 17%