UPDATED 11:00 AM EDT | JUL 15, 2016

FiveThirtyEight’s Pollster Ratings

FiveThirtyEight’s pollster ratings are calculated by analyzing the historical accuracy and the methodology of each firm’s polls. Accuracy scores account for the type of election, a poll’s sample size, the performance of other polls surveying the same race and other factors. We also calculate measures of statistical bias in the polls.

PollsterLive Caller With CellphonesInternetNCPP/​AAPOR/​RoperPolls analyzedSimple Average ErrorRaces Called CorrectlyAdvanced +/-Predictive +/-538 GradeBanned by 538Mean-Reverted Bias
SurveyUSA
763
4.6
90%
-1.0
-0.8
A
D+0.1
YouGov
707
6.7
93%
-0.3
+0.1
B
D+1.6
Rasmussen Reports/Pulse Opinion Research
657
5.3
79%
+0.4
+0.7
C+
R+2.0
Zogby Interactive/JZ Analytics
465
5.6
78%
+0.8
+1.2
C-
R+0.8
Mason-Dixon Polling & Research, Inc.
415
5.2
86%
-0.4
-0.2
B+
R+1.0
Public Policy Polling
383
4.9
82%
-0.5
-0.1
B+
R+0.2
Research 2000
279
5.5
88%
+0.2
+0.6
F
D+1.4
American Research Group
260
7.6
75%
+0.6
+0.7
C+
R+0.1
Quinnipiac University
169
4.7
87%
-0.3
-0.4
A-
R+0.7
Marist College
146
5.4
88%
-0.8
-0.8
A
R+0.7
Harris Interactive
135
5.5
86%
+1.2
+1.2
C-
R+1.5
TCJ Research
133
6.4
59%
+3.2
+3.0
F
R+4.5
Strategic Vision, LLC
129
4.0
88%
-0.3
+0.2
F
R+1.9
Opinion Savvy/InsiderAdvantage
105
7.8
71%
+0.9
+1.1
C-
D+0.7
University of New Hampshire
93
5.3
88%
-0.1
-0.3
B+
D+1.7
CNN/Opinion Research Corp.
89
5.5
76%
-0.3
-0.4
A-
R+0.1
Gallup
80
4.3
71%
+0.6
+0.3
B-
R+0.8
Monmouth University
71
5.5
85%
-1.5
-1.2
A+
D+0.6
Suffolk University
67
5.2
82%
-0.2
0.0
B+
D+0.7
Gravis Marketing
55
5.8
79%
0.0
+0.5
B-
R+1.1
CBS News/New York Times
55
4.7
75%
-0.3
-0.4
A-
D+0.6
Public Opinion Strategies
53
5.9
66%
0.0
+0.2
B
R+1.9
We Ask America
52
7.0
83%
+0.9
+1.1
C
R+0.9
ABC News/Washington Post
51
3.0
78%
-1.0
-0.9
A+
D+0.6
Ipsos
49
4.3
78%
-0.9
-0.4
A-
D+0.1
Greenberg Quinlan Rosner (Democracy Corps)
48
4.4
49%
+0.2
+0.3
B-
D+2.4
Mitchell Research & Communications
47
8.2
70%
+2.2
+1.8
D
R+0.1
EPIC-MRA
43
5.1
84%
-0.8
-0.3
A-
R+0.4
RT Strategies
42
5.8
71%
+0.3
-0.1
B+
D+1.1
Siena College
42
5.3
85%
-0.8
-0.7
A
R+0.3
Los Angeles Times
40
5.2
86%
-0.2
-0.4
A-
R+0.6
University of Cincinnati (Ohio Poll)
38
3.7
93%
-0.9
-0.7
A
R+1.5
Selzer & Company
37
4.6
84%
-1.6
-1.1
A+
R+0.0
Dan Jones & Associates
34
7.9
97%
+0.4
+0.8
C+
D+0.9
Fox News/Opinion Dynamics Corp.
34
3.9
72%
+0.1
+0.2
B
R+0.5
Emerson College
34
7.9
84%
+0.2
+0.3
B
R+1.3
George Washington University (Battleground)
32
3.5
56%
+0.2
+0.3
B
R+1.0
Princeton Survey Research Associates International
32
4.6
69%
0.0
-0.2
B+
D+0.3
Pharos Research Group
31
4.0
92%
-0.2
+0.1
F
D+0.9
ccAdvertising
30
7.1
88%
+1.6
+1.0
C
R+2.6
Angus Reid Global
29
3.3
93%
-2.0
-0.4
A-
R+1.3
Susquehanna Polling & Research, Inc.
29
5.3
79%
+0.3
+0.3
B-
D+0.1
Grove Insight
29
3.1
90%
-2.5
-0.8
A
D+0.5
RKM Research and Communications, Inc.
26
5.6
87%
-0.8
-0.2
B+
R+0.2
Market Shares Corp.
26
6.8
85%
+0.2
-0.1
B+
R+1.7
Research & Polling, Inc.
26
4.1
85%
-1.7
-0.6
A
R+0.7
NBC News/Wall Street Journal
25
4.2
74%
-0.6
-0.5
A-
D+0.5
Field Research Corporation (Field Poll)
25
3.9
100%
-2.5
-1.1
A+
R+1.1
Tarrance Group
24
6.2
83%
0.0
+0.2
B
R+0.7
Landmark Communications
24
4.9
88%
-0.9
+0.2
B
D+0.5
Fox News/Anderson Robbins Research/Shaw & Company Research
24
6.4
65%
-0.8
-0.6
A
D+0.4
KRC/Communications Research
22
6.9
91%
-0.2
+0.5
B-
D+0.2
Muhlenberg College
22
3.5
91%
-1.3
-0.8
A
R+0.5
Garin-Hart-Yang Research Group
22
5.3
86%
-0.9
-0.2
B+
D+1.3
Global Strategy Group
21
7.1
67%
+1.5
+0.8
C+
D+1.9
Merriman River Group
21
7.7
81%
+2.3
+1.1
C-
R+2.4
Franklin Pierce University
21
6.6
83%
+0.8
+0.5
B-
D+1.3
Mellman Group
21
4.9
79%
-0.2
+0.1
B
D+1.6
Pew Research Center
20
3.4
57%
+0.1
-0.2
B+
D+0.6
GfK Group
19
3.4
92%
-1.1
-0.2
B+
R+0.1
McLaughlin & Associates
19
5.7
84%
+1.5
+1.2
C-
R+0.5
Blum & Weprin Associates
18
4.6
94%
-2.6
-0.6
A
R+1.0
Fairleigh Dickinson University (PublicMind)
18
4.1
94%
-1.3
-0.7
A
D+0.0
Penn Schoen Berland
18
7.6
67%
+0.9
+0.5
B-
D+2.5
Elway Research
18
4.0
89%
-2.3
-1.0
A+
D+0.5
Franklin & Marshall College
18
5.7
94%
+0.1
-0.2
B+
R+0.4
Columbus Dispatch
18
4.9
97%
+0.6
+0.8
C+
D+1.1
Ciruli Associates
17
3.6
94%
-2.0
-1.0
A+
R+0.7
Critical Insights
17
8.6
88%
+2.4
+1.0
C
D+0.3
Pan Atlantic SMS Group
17
6.8
91%
-0.5
0.0
B
D+0.9
IBD/TIPP
17
2.3
76%
-1.6
-0.4
A-
R+0.7
SoonerPoll.com
16
8.5
81%
+1.0
+0.1
B
D+1.8
Fleming & Associates
15
5.1
100%
-1.0
-0.1
B+
R+0.3
New England College
15
3.0
77%
-1.3
+0.2
B
R+0.6
Financial Dynamics
15
2.8
100%
-1.1
+0.3
B
R+0.7
University of Massachusetts Lowell
14
5.3
93%
-0.2
+0.1
B
R+0.1
Ward Research (Honolulu Star-Advertiser)
14
6.0
75%
-0.7
0.0
B+
R+0.6
Magellan Strategies
13
7.7
92%
+0.8
+0.9
C
R+0.6
Rutgers University
13
5.7
85%
+2.1
+0.4
B-
D+0.1
Star Tribune
13
6.3
46%
+2.1
+0.8
C+
D+1.5
Roanoke College
12
9.0
75%
+3.6
+0.8
C+
D+0.3
St. Norbert College
12
3.9
88%
-1.8
-0.3
A-
D+0.3
Brown University
12
11.4
83%
+4.0
+1.4
C-
R+0.4
Opinion Research Associates
12
7.9
71%
+3.7
+1.3
C-
D+1.7
National Journal
12
2.6
100%
-2.6
-0.8
A
R+0.2
Google Consumer Surveys
12
2.2
83%
-1.9
+0.1
B
R+0.6
Davis, Hibbitts & Midghall, Inc.
12
4.3
83%
-0.6
0.0
B
R+0.0
Trafalgar Group
12
9.1
92%
+1.6
+1.1
C
Overtime Politics
12
9.8
67%
+0.8
+0.4
F
Tel Opinion Research
12
4.7
96%
0.0
+0.2
B
R+0.0
Public Policy Institute of California
12
4.1
100%
-2.0
-0.8
A
R+0.7
Vox Populi Communications
11
4.1
77%
-1.6
+0.2
B
R+0.0
Richard Day Research, Inc.
11
5.5
100%
-0.6
+0.5
B-
R+0.8
Anzalone Liszt Grove Research
11
7.6
55%
+2.8
+1.0
C
D+1.4
University of Massachusetts Amherst
11
6.5
100%
-0.5
+0.1
B
R+0.4
Capital Survey Research Center
11
7.8
36%
-1.0
+0.4
B-
D+0.1
MassINC Polling Group
11
3.1
100%
-2.4
-0.3
A-
R+0.2
SurveyMonkey
11
11.2
91%
+2.5
+1.3
C-
Western New England University
11
5.8
86%
-0.3
-0.3
A-
R+1.2
Big Ten
10
4.8
100%
+1.4
+1.0
C
D+1.1
Loras College
10
9.7
70%
+1.0
+0.5
B-
D+1.1
Normington, Petts & Associates
10
6.4
60%
+0.6
+0.8
C+
D+0.7
Louisville Courier-Journal
10
3.3
80%
-1.7
+0.2
B
R+0.3
University of Washington
10
4.0
100%
-0.9
0.0
B
D+0.2
Humphrey Institute
10
13.1
40%
+6.8
+2.3
D-
D+0.8
Wilson Research Strategies
10
6.9
65%
+1.0
+0.5
B-
R+0.1
University of New Orleans
9
6.7
78%
+1.5
+1.0
C
D+0.3
Lake Research Partners
9
3.8
83%
-2.3
-0.2
B+
D+0.5
Talmey-Drake Research & Strategy, Inc.
9
7.7
50%
+1.6
+0.6
C+
R+0.4
Harper Polling
9
4.1
100%
-1.1
+0.4
B-
D+0.3
Market Research Institute, Inc.
9
2.9
100%
-2.4
+0.2
B
R+0.3
Benenson Strategy Group
9
6.2
50%
+0.6
+0.4
B-
D+0.7
Gonzales Research & Marketing Strategies, Inc.
9
6.4
78%
+1.0
+0.5
B-
R+0.4
Clout Research/Wenzel Strategies
9
9.0
33%
+4.7
+1.3
C-
R+1.7
Dittman Research
9
5.9
100%
+0.2
+0.3
B-
D+1.0
Harstad Strategic Research, Inc.
9
3.8
72%
-1.0
0.0
B+
D+0.8
St. Cloud State University
9
6.5
67%
+2.2
+0.7
C+
D+0.4
Hendrix College
9
6.7
89%
0.0
+0.6
C+
D+1.5
University of South Alabama
8
2.8
100%
-3.0
-0.2
B+
R+0.4
National Research, Inc.
8
5.1
81%
-1.9
-0.2
B+
R+0.5
Southeastern Louisiana University
8
6.6
88%
+2.4
+1.2
C-
D+0.0
Datamar
8
6.3
69%
+1.7
+1.0
C
R+0.4
Hamilton Campaigns
8
7.0
56%
+2.6
+0.8
C+
D+1.5
Arizona State University
8
8.0
100%
+2.2
+0.7
C+
D+0.9
Potomac Incorporated
8
4.5
88%
-1.4
+0.4
B-
R+0.5
Schroth, Eldon & Associates
8
3.2
88%
-1.1
+0.4
B-
D+0.6
Marquette University
7
2.6
100%
-3.8
-0.6
A
R+0.1
University of Connecticut
7
3.6
93%
-1.6
-0.5
A-
R+0.4
Maine People's Resource Center
7
7.5
86%
+1.9
+1.0
C
D+0.3
West Chester University
7
5.2
100%
+0.2
+0.7
C+
D+0.2
Marketing Workshop
7
9.7
57%
+4.0
+1.4
D+
D+0.3
Hays Research Group
7
7.7
71%
+2.6
+0.7
C+
D+1.1
Wiese Research Associates, Inc.
7
8.8
100%
+2.6
+0.7
C+
D+1.3
Market Research Insight
7
1.8
100%
-4.4
-0.1
B+
D+0.2
Constituent Dynamics
7
7.4
86%
0.0
+0.7
C+
R+0.0
Behavior Research Center (Rocky Mountain)
7
3.5
71%
-2.5
-0.6
A
D+0.1
Montana State University Billings
7
3.6
57%
-3.7
-0.1
B+
D+0.6
Fairbank, Maslin, Maullin, Metz & Associates
7
5.9
79%
+0.9
+0.4
B-
D+1.0
Howey Politics/DePauw University
7
6.8
57%
+1.2
+0.5
B-
D+0.1
Glengariff Group, Inc.
7
4.7
71%
-0.2
+0.2
B
R+0.1
Riley Research Associates
7
2.7
100%
-2.4
-0.1
B+
R+0.1
Time/Abt SRBI
7
3.2
100%
-1.5
-0.5
A-
D+0.4
Baydoun Consulting
6
6.8
83%
+4.0
+1.3
C-
R+1.0
Yankelovich Partners, Inc.
6
7.0
42%
+0.3
+0.3
B-
R+0.1
OnMessage Inc.
6
9.1
67%
+2.7
+0.7
C+
R+1.1
Temple University
6
3.7
100%
-1.5
0.0
B+
R+0.4
American Viewpoint
6
4.0
67%
-1.4
0.0
B
R+0.6
Public Strategies, Inc.
6
7.9
100%
+0.8
+0.8
C+
Marketing Resource Group (MRG)
6
11.0
17%
+1.9
+0.6
C+
R+0.3
Moore Information
6
6.5
67%
-0.3
+0.2
B
R+0.5
Voter/Consumer Research
6
5.5
100%
-0.7
+0.1
B
R+0.2
OpinionWorks
6
7.3
92%
+1.0
+0.4
B-
R+0.5
Ethridge & Associates, LLC
6
2.7
83%
-2.4
+0.3
B-
R+0.1
Valley Research
6
11.5
83%
+5.7
+1.6
D+
D+0.4
University of Wisconsin (Badger Poll)
6
6.9
83%
0.0
+0.3
B
D+0.2
Nielson Brothers Polling
6
8.5
83%
+4.1
+1.4
C-
D+1.4
DFM Research
5
6.3
80%
+0.5
+0.3
B-
D+0.9
JMC Enterprises
5
7.8
100%
+1.0
+0.8
C
R+0.9
Stockton College
5
4.5
100%
-0.6
+0.2
B
D+0.5
Millersville University
5
14.1
80%
+7.2
+1.7
D
R+1.5
20/20 Insight
5
16.6
40%
+3.6
+1.2
C-
D+0.0
Greg Smith and Associates
5
8.5
60%
+2.6
+1.1
C
D+1.2
Greenberg Quinlan Rosner/American Viewpoint
5
4.4
100%
-2.8
0.0
B+
R+0.6
Clemson University
5
10.3
100%
-1.7
0.0
B
R+0.5
Crawford Johnson & Northcott Inc.
5
4.7
100%
-3.0
+0.4
B-
D+0.1
Rhode Island College
5
6.1
100%
0.0
+0.7
C+
R+0.2
Ivan Moore Research
5
9.4
40%
+4.5
+0.9
C
D+1.3
Hellenthal & Associates
5
8.2
40%
+3.4
+0.7
C+
D+0.4
Virginia Commonwealth University
5
4.9
100%
+0.8
+0.4
B-
R+0.3
International Communications Research, Inc.
5
3.1
20%
-1.6
+0.5
B-
R+0.1
Ed Renwick
5
6.5
80%
+1.1
+0.8
C
D+0.1
Consumer Logic
4
8.8
50%
+3.8
+1.1
C-
D+0.6
Market Solutions Group
4
4.3
100%
-1.0
+0.6
C+
R+0.0
Brigham Young University
4
16.5
75%
+7.2
+1.5
D+
D+1.9
Wirthlin Worldwide
4
4.6
75%
-0.8
+0.6
C+
R+0.5
Fort Hays State University
4
23.8
50%
+9.3
+1.4
C-
Clarity Campaign Labs
4
3.2
63%
-0.1
+0.3
B
D+0.4
Optimus
4
13.3
50%
+5.0
+1.3
C-
R+0.8
Northern Arizona University
4
3.6
100%
-3.3
+0.5
B-
R+0.4
Hill Research Consultants
4
5.4
50%
-0.1
+0.3
B
R+0.4
University of Texas
4
1.2
100%
-5.0
+0.5
B-
D+0.1
University of Arkansas
4
2.4
100%
-5.5
-0.4
A-
D+0.3
Marshall Marketing & Communications
4
2.8
100%
-2.2
+0.5
B-
R+0.2
Jim Meader (KELOLAND-TV)
4
4.6
100%
-0.3
+0.7
C+
D+0.5
IVR Polls
4
4.1
100%
-2.2
+0.5
B-
CallFire
4
3.9
75%
+0.6
+0.3
B-
R+0.5
University of North Florida
4
4.5
50%
-1.0
-0.3
B+
D+0.3
OnPoint
4
1.7
100%
-1.9
+0.5
B-
D+0.2
Middle Tennessee State University
4
8.0
100%
+0.9
+0.4
B-
D+0.1
Scripps Howard
4
3.8
100%
-1.9
+0.5
B-
R+0.1
Strategies 360
4
2.0
63%
-3.2
0.0
B
R+0.1
Minnesota State University Moorhead
4
9.3
100%
+2.0
+0.9
C
D+0.5
Elon University
4
4.0
50%
+0.7
-0.1
B+
D+0.4
Southern Media & Opinion Research
4
6.4
100%
+0.9
+0.4
B-
D+0.0
Frank N. Magid Associates, Inc.
4
4.6
100%
-1.8
+0.5
B-
D+0.5
Orion Strategies
4
3.1
100%
-3.6
+0.5
B-
D+0.1
Philadelphia Inquirer
4
3.0
100%
-1.5
+0.1
B
R+0.3
Market Decisions
4
5.2
100%
-1.0
+0.2
B
R+0.1
Alabama State University
4
6.4
50%
-3.4
+0.5
B-
Political Marketing International, Inc./Red Racing Horses
4
4.3
63%
-1.2
+0.6
B-
D+0.1
Richmond Times-Dispatch
4
3.3
100%
-1.1
+0.1
B
D+0.3
Purple Strategies
4
3.0
88%
-1.2
+0.6
B-
R+0.4
Cole Hargrave Snodgrass & Associates
4
6.3
75%
-1.3
+0.1
B
D+0.3
Kimball Political Consulting
4
8.1
75%
+4.7
+0.8
C+
R+1.0
Manhattanville College
3
6.5
100%
-0.9
+0.6
C+
R+0.5
Midwest Survey and Research
3
7.3
100%
-0.9
+0.6
C+
R+0.1
CPEC LLC
3
16.2
100%
+7.7
+1.4
D+
Personal Marketing Research
3
6.2
67%
-2.2
+0.5
B-
McCulloch Research & Polling
3
4.9
67%
-0.1
+0.7
C+
R+0.3
CVOTER International
3
2.9
100%
-1.3
+0.6
C+
R+0.3
Data West Polling
3
14.6
33%
+7.0
+1.3
C-
D+1.3
PSI
3
12.5
67%
+2.5
+0.9
C
R+0.1
Castleton University
3
9.9
100%
-1.0
-0.2
B+
Knowledge Networks
3
4.1
100%
-1.1
+0.2
B
R+0.0
Western Kentucky University
3
13.7
67%
+4.8
+0.7
C+
D+0.8
Momentum Analysis
3
13.7
33%
+6.8
+0.9
C
D+0.5
Indiana University-Purdue University Fort Wayne
3
23.5
0%
+10.3
+1.2
C-
University of Iowa
3
15.9
67%
+5.0
+0.7
C+
R+0.2
US News & World Report
3
1.9
100%
-4.7
+0.5
B-
R+0.1
University of Wisconsin Milwaukee
3
5.3
100%
-1.5
+0.6
C+
R+0.5
Polling Company/Global Strategy Group (Hotline Bullseye)
3
4.6
33%
+2.0
+0.9
C
R+0.4
Braun Research
3
9.1
100%
+3.3
+0.6
C+
D+0.8
Wilson Perkins Allen Opinion Research
3
6.0
67%
-0.8
+0.2
B
R+0.3
Iowa State University
3
6.3
67%
-3.5
+0.5
B-
Decision Forecasting
3
8.1
100%
+1.6
+0.9
C
R+0.1
Zimmerman & Associates/Marketing Intelligence
3
4.7
100%
+0.6
+0.8
C+
D+0.3
TargetPoint
3
14.0
83%
+3.9
+1.1
C
The Polling Company Inc.
3
3.7
100%
-1.5
+0.1
B
R+0.0
RAND (American Life Panel)
3
1.2
100%
-3.4
+0.5
B-
R+0.0
Becker Institute
3
7.6
67%
+0.8
+0.8
C+
D+0.7
Clarus Research Group
3
6.8
100%
+0.8
+0.4
B-
D+0.5
MSR Group
3
3.5
100%
-2.8
+0.5
B-
D+0.3
Christopher Newport University
3
6.8
100%
+0.7
+0.3
B-
D+0.6
Dixie Strategies
3
7.9
83%
-0.9
+0.6
C+
NPR
3
5.0
17%
+0.5
+0.3
B-
D+0.1
Illinois Wesleyan University
3
8.2
100%
+1.4
+0.8
C+
R+0.7
Keating Research, Inc.
3
2.2
67%
-3.0
+0.1
B
R+0.0
Missouri State University
3
4.4
67%
-2.4
+0.1
B
D+0.4
Lycoming College
3
7.3
67%
+1.3
+0.8
C+
D+0.7
Bannon Communications
2
10.4
100%
+4.0
+1.0
C
D+0.6
RBI Strategies & Research
2
0.7
100%
-6.6
+0.2
B
R+0.0
StPetePolls.org
2
2.0
25%
-1.0
+0.7
C+
D+0.1
Dane & Associates
2
21.2
50%
+13.1
+1.5
D+
R+1.3
Baselice & Associates, Inc.
2
10.0
100%
+4.3
+0.6
C+
D+0.2
WCIA-TV
2
18.3
100%
+10.7
+1.4
C-
R+1.1
Fabrizio, Lee & Associates
2
5.9
50%
-0.4
+0.3
B
D+0.4
Indiana University
2
0.9
100%
-4.2
-0.3
B+
D+0.1
Gordon S. Black Corp.
2
6.3
100%
-0.1
+0.7
C+
R+0.4
GaPundit.com
2
8.3
25%
+3.0
+0.9
C
D+0.5
Massie & Associates
2
23.9
0%
+14.4
+1.6
D+
R+1.5
High Point University
2
1.0
100%
-5.6
-0.3
B+
D+0.0
GBA Strategies
2
3.7
100%
-2.7
+0.2
B
R+0.2
Rice University
2
5.9
100%
+0.1
+0.7
C+
D+0.4
McKeon & Associates
2
0.9
100%
-6.6
+0.2
B
R+0.0
Tulchin Research
2
3.5
100%
-3.2
+0.2
B
R+0.2
Loyola University (New Orleans)
2
12.1
100%
+9.6
+1.3
C-
D+0.8
Zata3
2
10.2
100%
+2.8
+0.9
C
R+0.2
Baruch College
2
5.7
100%
-0.1
+0.3
B-
Merrill Poll
2
8.7
100%
-0.7
+0.2
B
Kiley & Company
2
5.1
100%
-1.7
+0.2
B
D+0.2
M4 Strategies
2
3.1
100%
-6.2
+0.6
C+
R+0.2
Cherry Communications
2
9.2
75%
+2.5
+0.9
C
R+0.1
Louis Harris & Associates
2
0.9
100%
-4.5
+0.6
C+
D+0.1
Ohio University
2
8.8
50%
+7.7
+1.2
C-
D+0.5
Master Image
2
1.2
100%
-4.1
+0.6
C+
MarblePort
2
5.6
100%
+0.5
+0.8
C+
R+0.2
Belden Russonello
2
4.7
100%
+0.2
+0.3
B-
D+0.2
Basswood Research
2
10.7
100%
+0.6
+0.8
C+
R+0.4
University of Alabama
2
12.0
100%
+7.0
+1.2
C-
R+0.8
ResearchNow
2
9.4
100%
+0.8
+0.8
C+
Douglas Fulmer & Associates
2
5.1
100%
-2.9
+0.6
C+
TMR Research
2
7.8
0%
+2.0
+0.8
C
D+0.5
Forward Strategies
2
1.3
100%
-2.7
+0.6
C+
D+0.1
West Virginia Research Center
2
6.5
50%
+0.9
+0.8
C+
D+0.4
Lincoln Institute
2
4.1
75%
-2.7
+0.6
C+
R+0.3
Crosswind Media & Public Relations
2
6.5
100%
-2.0
+0.6
C+
Texas Credit Union League
2
7.0
100%
-1.9
+0.6
C+
Dartmouth College
2
9.0
100%
-0.4
+0.3
B
Frederick Polls
2
2.4
75%
-4.9
+0.2
B
R+0.0
Schapiro Group
2
20.0
100%
+5.0
+1.0
C
Research America Inc.
2
20.7
100%
+8.2
+0.8
C+
Opinion Consultants
2
6.5
100%
+1.4
+0.8
C+
R+0.4
North Star Opinion Research/Ayres, McHenry & Associates
2
7.0
50%
+2.6
+0.5
B-
R+0.4
CrossTarget
2
7.7
100%
+1.6
+0.8
C+
R+0.5
Abacus Associates
2
12.1
50%
+4.9
+1.0
C
R+0.0
SocialSphere
2
6.1
100%
+2.9
+0.5
B-
R+0.4
APC Research
2
2.5
100%
-3.5
+0.2
B
D+0.2
Independent Market Research
2
5.7
100%
+1.7
+0.8
C+
D+0.3
Florida Atlantic University
2
3.7
100%
-1.3
+0.6
C+
Rivercity Polling
1
6.7
100%
-1.7
+0.7
C+
R+0.2
University of Georgia
1
9.8
100%
+3.0
+0.8
C+
R+0.3
Great Lakes Strategies Group
1
7.6
0%
+2.8
+0.8
C+
R+0.2
Ron Lester and Associates
1
18.9
100%
+3.3
+0.8
C+
TeleResearch Corporation
1
8.6
100%
+2.2
+0.8
C+
Harvard University
1
6.9
0%
+1.2
+0.8
C+
D+0.2
R.L. Repass & Partners
1
11.2
100%
+1.2
+0.8
C+
A&A Research
1
10.1
0%
+3.7
+0.8
C
R+0.3
Southern Opinion Research
1
9.4
100%
+3.7
+0.8
C
D+0.3
University of South Florida
1
3.9
100%
+0.8
+0.8
C+
R+0.1
California State University, Bakersfield
1
9.9
0%
+3.9
+0.9
C
R+0.3
New Frontier Strategy
1
21.6
0%
+3.9
+0.9
C
Strategic Services
1
5.5
0%
+0.5
+0.7
C+
D+0.2
Liberty Opinion Research
1
5.7
100%
+0.5
+0.7
C+
Marketing Research Institute
1
7.4
0%
+4.6
+0.9
C
R+0.2
Cromer Group
1
3.9
100%
+0.4
+0.7
C+
R+0.1
Glascock Group
1
12.1
0%
+4.8
+0.9
C
Target Insyght
1
15.4
100%
+4.9
+0.9
C
Glover Park Group
1
11.4
0%
+4.9
+0.9
C
R+0.4
Inside Michigan Politics
1
13.2
0%
+5.0
+0.9
C
Saint Leo University
1
4.1
0%
+0.2
+0.7
C+
D+0.1
Tulsa Surveys
1
11.9
100%
+5.2
+0.9
C
R+0.4
ASA Marketing Group
1
5.5
100%
-0.4
+0.7
C+
D+0.2
Y2 Analytics
1
28.4
100%
+12.6
+0.7
C+
Arthur J. Finkelstein & Associates
1
13.7
0%
+5.5
+0.9
C
R+0.4
SMS Research & Marketing Services, Inc.
1
9.8
0%
+5.7
+0.9
C
R+0.3
GCR & Associates
1
18.3
100%
+6.1
+0.9
C
Ohio State University
1
3.7
100%
-0.7
+0.7
C+
R+0.1
Wick Communications
1
2.8
100%
-0.8
+0.7
C+
D+0.1
MarketAide Services, Inc.
1
11.2
100%
+6.9
+1.0
C
D+0.4
NRECA Market Research
1
6.3
100%
-1.0
+0.7
C+
D+0.2
Analytical Group
1
4.0
100%
-1.1
+0.7
C+
D+0.1
Iona College
1
4.4
100%
-1.1
+0.7
C+
D+0.1
Anderson Group
1
10.9
0%
+7.8
+1.0
C
R+0.4
QEV Analytics
1
7.3
0%
-1.9
+0.2
B
Triumph Campaigns
1
4.2
100%
-1.2
+0.7
C+
R+0.1
Forman Center
1
2.6
100%
-1.2
+0.7
C+
D+0.1
University of Nevada Las Vegas
1
9.0
100%
+0.9
+0.3
B-
Val Smith
1
8.5
100%
+2.0
+0.4
B-
R+0.3
War Room Logistics
1
4.5
100%
-1.6
+0.7
C+
Victoria Research & Consulting
1
8.1
50%
+1.0
+0.3
B-
D+0.3
Diversified Research Inc
1
5.0
100%
-2.0
+0.7
C+
R+0.2
Neighborhood Research Corporation
1
3.4
100%
-2.1
+0.7
C+
R+0.1
Jeffrey Stonecash
1
17.3
0%
+10.7
+1.1
C
R+0.6
Diamond State Consulting Group
1
4.2
100%
-2.2
+0.7
C+
D+0.1
Winston Group
1
6.3
100%
-2.4
+0.7
C+
D+0.2
Vanderbilt University
1
8.9
100%
+0.5
-0.1
B+
Hampton University
1
3.5
100%
-1.8
+0.2
B
D+0.1
Rainmaker Media Group
1
12.7
100%
+12.5
+1.1
C-
D+0.4
Red Sea Communications
1
4.4
100%
-2.4
+0.7
C+
R+0.1
New Mexico State University
1
6.8
0%
-2.5
+0.7
C+
Probolsky Research
1
4.9
0%
+0.3
+0.3
B-
R+0.2
Neighbor
1
17.1
100%
+13.7
+1.2
C-
R+0.6
Aspen Media & Market Research
1
3.5
100%
-2.7
+0.7
C+
R+0.1
Multi Quest International Inc
1
1.9
100%
-2.8
+0.7
C+
D+0.1
RABA Research
1
3.8
100%
-0.4
+0.3
B-
MBQF
1
4.3
100%
-2.9
+0.7
C+
Multi-Quest International
1
4.1
0%
-3.0
+0.7
C+
University of North Carolina
1
1.6
100%
-3.0
+0.7
C+
D+0.1
University of Florida
1
1.1
50%
-2.2
-0.2
B+
D+0.0
Central Surveys, Inc.
1
1.7
0%
-3.3
+0.7
C+
D+0.1
Cooper & Secrest
1
2.6
0%
-3.5
+0.7
C+
R+0.1
BIGresearch
1
2.0
100%
-3.6
+0.7
C+
Lauer Lalley Victoria, Inc.
1
1.7
100%
-3.6
+0.7
C+
R+0.1
Wood Communications Group
1
0.8
100%
-3.8
+0.7
C+
D+0.0
Cranford & Associates
1
2.5
100%
-3.9
+0.7
C+
D+0.1
Dynamic Marketing, Inc.
1
3.0
100%
-4.1
+0.7
C+
D+0.1
RMS Research
1
0.9
100%
-5.4
+0.7
C+
R+0.0
Schoen Consulting
1
2.3
100%
-0.7
+0.3
B-
R+0.1
Market Strategies International
1
1.1
100%
-5.6
+0.7
C+
R+0.0
University of Tennessee
1
2.7
100%
-5.6
+0.7
C+
R+0.1
Old Dominion University
1
4.5
100%
-1.0
+0.3
B
D+0.1
Riggs Research Services
1
33.7
0%
+24.0
+1.5
D+
D+1.1
Canisius College
1
0.1
100%
-5.8
+0.7
C+
Hoffman Research Group
1
7.1
100%
+2.2
+0.4
B-
R+0.2
Florida International University/Univision
1
1.8
100%
-5.7
+0.2
B
D+0.1
University of Illinois at Chicago
1
14.1
100%
+7.2
+0.5
B-
R+0.5
Lauer Johnson Research
1
13.8
0%
+7.2
+0.5
B-
D+0.4
Jayhawk Consulting
1
42.9
0%
+31.8
+1.8
D
D+1.4
University of Houston
1
2.0
100%
-6.6
+0.2
B
Feldman Group
1
10.8
0%
+3.7
+0.4
B-
D+0.3
Rossman Group
1
4.2
100%
+0.6
+0.7
C+
D+0.1
Pollster
The organization that conducted the poll (rather than the organization that paid for or sponsored it).
Live caller with cellphones

indicates the polling firm usually or always uses live telephone interviews and places calls to cellphones in addition to landlines (as of May 27, 2016). Text messages do not count.

We assume a polling firm has not begun to include cellphones in its samples until we have evidence to the contrary. Pollsters that have routinely begun to include cellphones in their samples but are listed without a should contact FiveThirtyEight.

Internet
Whether the polling firm usually conducts all of its interviews online, as of May 27, 2016.
NCPP/AAPOR/Roper
indicates that the polling firm was a member of the National Council on Public Polls (NCPP), a signatory to the American Association for Public Opinion Research (AAPOR) Transparency Initiative or a contributor to the Roper Center for Public Opinion Research data archive as of May 27, 2016.
Polls analyzed
The number of polls a firm conducted in the final three weeks of U.S. House, U.S. Senate, gubernatorial and presidential general election campaigns since 1998, and the last three weeks before presidential primaries and caucuses from 2000 through June 7, 2016.
Simple average error
A polling firm’s average error, calculated as the difference between the polled result and the actual result for the margin separating the top two finishers in the race.
Races called correctly
The percentage of polls in which the polling firm correctly identified the winner of the race. If the poll indicated a tie for the lead and one of the tied candidates won, the pollster received credit for half a win.
Advanced +/-
How a pollster’s average error has compared with other polling firms surveying the same races, accounting for the type of election polled, the number of days until the election, the poll’s sample size, the competitiveness of the race and the number of other pollsters surveying the same race. Negative scores are favorable and indicate above-average quality.
Predictive +/-
A projection of how accurate a pollster’s survey will be in future elections relative to other polls, based on a combination of a pollster’s historical performance, the number of polls it has in the database and our proxies for methodological quality. Negative scores are favorable and indicate above-average quality.
538 grade
A letter grade from A+ to F that reflects a pollster’s Predictive Plus-Minus score. Firms banned by FiveThirtyEight are automatically given a grade of F.
Banned by 538
✖ indicates that the polling firm is not used in FiveThirtyEight’s election forecasting models because we are concerned that it has faked some polling results or engaged in other gross ethical misconduct.
Mean-reverted bias
A pollster’s historical average statistical bias toward Democratic or Republican candidates, reverted to a mean of zero based on the number of polls in the database.

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