UPDATED Aug. 5, 2016 at 10:15 AM

FiveThirtyEight’s Pollster Ratings

FiveThirtyEight’s pollster ratings are calculated by analyzing the historical accuracy of each firm’s polls along with its methodology. Accuracy scores are adjusted for the type of election polled, a firm’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.

See also: Methodology | 2016 Primary Forecasts | National 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
Princeton Survey Research Associates International
32
4.6
69%
0.0
-0.2
B+
D+0.3
George Washington University (Battleground)
32
3.5
56%
+0.2
+0.3
B
R+1.0
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
Grove Insight
29
3.1
90%
-2.5
-0.8
A
D+0.5
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
Market Shares Corp.
26
6.8
85%
+0.2
-0.1
B+
R+1.7
RKM Research and Communications, Inc.
26
5.6
87%
-0.8
-0.2
B+
R+0.2
Research & Polling, Inc.
26
4.1
85%
-1.7
-0.6
A
R+0.7
Field Research Corporation (Field Poll)
25
3.9
100%
-2.5
-1.1
A+
R+1.1
NBC News/Wall Street Journal
25
4.2
74%
-0.6
-0.5
A-
D+0.5
Fox News/Anderson Robbins Research/Shaw & Company Research
24
6.4
65%
-0.8
-0.6
A
D+0.4
Landmark Communications
24
4.9
88%
-0.9
+0.2
B
D+0.5
Tarrance Group
24
6.2
83%
0.0
+0.2
B
R+0.7
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
KRC/Communications Research
22
6.9
91%
-0.2
+0.5
B-
D+0.2
Global Strategy Group
21
7.1
67%
+1.5
+0.8
C+
D+1.9
Mellman Group
21
4.9
79%
-0.2
+0.1
B
D+1.6
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
Pew Research Center
20
3.4
57%
+0.1
-0.2
B+
D+0.6
McLaughlin & Associates
19
5.7
84%
+1.5
+1.2
C-
R+0.5
GfK Group
19
3.4
92%
-1.1
-0.2
B+
R+0.1
Fairleigh Dickinson University (PublicMind)
18
4.1
94%
-1.3
-0.7
A
D+0.0
Franklin & Marshall College
18
5.7
94%
+0.1
-0.2
B+
R+0.4
Penn Schoen Berland
18
7.6
67%
+0.9
+0.5
B-
D+2.5
Columbus Dispatch
18
4.9
97%
+0.6
+0.8
C+
D+1.1
Elway Research
18
4.0
89%
-2.3
-1.0
A+
D+0.5
Blum & Weprin Associates
18
4.6
94%
-2.6
-0.6
A
R+1.0
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
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
Fleming & Associates
15
5.1
100%
-1.0
-0.1
B+
R+0.3
Ward Research (Honolulu Star-Advertiser)
14
6.0
75%
-0.7
0.0
B+
R+0.6
University of Massachusetts Lowell
14
5.3
93%
-0.2
+0.1
B
R+0.1
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
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
Davis, Hibbitts & Midghall, Inc.
12
4.3
83%
-0.6
0.0
B
R+0.0
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
National Journal
12
2.6
100%
-2.6
-0.8
A
R+0.2
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
Google Consumer Surveys
12
2.2
83%
-1.9
+0.1
B
R+0.6
Overtime Politics
12
9.8
67%
+0.8
+0.4
F
✖
Trafalgar Group
12
9.1
92%
+1.6
+1.1
C
MassINC Polling Group
11
3.1
100%
-2.4
-0.3
A-
R+0.2
Capital Survey Research Center
11
7.8
36%
-1.0
+0.4
B-
D+0.1
University of Massachusetts Amherst
11
6.5
100%
-0.5
+0.1
B
R+0.4
Vox Populi Communications
11
4.1
77%
-1.6
+0.2
B
R+0.0
Anzalone Liszt Grove Research
11
7.6
55%
+2.8
+1.0
C
D+1.4
Richard Day Research, Inc.
11
5.5
100%
-0.6
+0.5
B-
R+0.8
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
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
Big Ten
10
4.8
100%
+1.4
+1.0
C
D+1.1
Market Research Institute, Inc.
9
2.9
100%
-2.4
+0.2
B
R+0.3
Hendrix College
9
6.7
89%
0.0
+0.6
C+
D+1.5
Harstad Strategic Research, Inc.
9
3.8
72%
-1.0
0.0
B+
D+0.8
Gonzales Research & Marketing Strategies, Inc.
9
6.4
78%
+1.0
+0.5
B-
R+0.4
Lake Research Partners
9
3.8
83%
-2.3
-0.2
B+
D+0.5
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
Harper Polling
9
4.1
100%
-1.1
+0.4
B-
D+0.3
Benenson Strategy Group
9
6.2
50%
+0.6
+0.4
B-
D+0.7
University of New Orleans
9
6.7
78%
+1.5
+1.0
C
D+0.3
St. Cloud State University
9
6.5
67%
+2.2
+0.7
C+
D+0.4
Talmey-Drake Research & Strategy, Inc.
9
7.7
50%
+1.6
+0.6
C+
R+0.4
Datamar
8
6.3
69%
+1.7
+1.0
C
R+0.4
Schroth, Eldon & Associates
8
3.2
88%
-1.1
+0.4
B-
D+0.6
Hamilton Campaigns
8
7.0
56%
+2.6
+0.8
C+
D+1.5
Southeastern Louisiana University
8
6.6
88%
+2.4
+1.2
C-
D+0.0
Potomac Incorporated
8
4.5
88%
-1.4
+0.4
B-
R+0.5
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
Arizona State University
8
8.0
100%
+2.2
+0.7
C+
D+0.9
Montana State University Billings
7
3.6
57%
-3.7
-0.1
B+
D+0.6
Behavior Research Center (Rocky Mountain)
7
3.5
71%
-2.5
-0.6
A
D+0.1
Constituent Dynamics
7
7.4
86%
0.0
+0.7
C+
R+0.0
Fairbank, Maslin, Maullin, Metz & Associates
7
5.9
79%
+0.9
+0.4
B-
D+1.0
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
Glengariff Group, Inc.
7
4.7
71%
-0.2
+0.2
B
R+0.1
Wiese Research Associates, Inc.
7
8.8
100%
+2.6
+0.7
C+
D+1.3
Hays Research Group
7
7.7
71%
+2.6
+0.7
C+
D+1.1
Riley Research Associates
7
2.7
100%
-2.4
-0.1
B+
R+0.1
Market Research Insight
7
1.8
100%
-4.4
-0.1
B+
D+0.2
Howey Politics/DePauw University
7
6.8
57%
+1.2
+0.5
B-
D+0.1
University of Connecticut
7
3.6
93%
-1.6
-0.5
A-
R+0.4
Time/Abt SRBI
7
3.2
100%
-1.5
-0.5
A-
D+0.4
Marquette University
7
2.6
100%
-3.8
-0.6
A
R+0.1
Marketing Workshop
7
9.7
57%
+4.0
+1.4
D+
D+0.3
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
University of Wisconsin (Badger Poll)
6
6.9
83%
0.0
+0.3
B
D+0.2
American Viewpoint
6
4.0
67%
-1.4
0.0
B
R+0.6
Marketing Resource Group (MRG)
6
11.0
17%
+1.9
+0.6
C+
R+0.3
OpinionWorks
6
7.3
92%
+1.0
+0.4
B-
R+0.5
Nielson Brothers Polling
6
8.5
83%
+4.1
+1.4
C-
D+1.4
Temple University
6
3.7
100%
-1.5
0.0
B+
R+0.4
Valley Research
6
11.5
83%
+5.7
+1.6
D+
D+0.4
Voter/Consumer Research
6
5.5
100%
-0.7
+0.1
B
R+0.2
Public Strategies, Inc.
6
7.9
100%
+0.8
+0.8
C+
Ethridge & Associates, LLC
6
2.7
83%
-2.4
+0.3
B-
R+0.1
Moore Information
6
6.5
67%
-0.3
+0.2
B
R+0.5
Rhode Island College
5
6.1
100%
0.0
+0.7
C+
R+0.2
JMC Enterprises
5
7.8
100%
+1.0
+0.8
C
R+0.9
20/20 Insight
5
16.6
40%
+3.6
+1.2
C-
D+0.0
Stockton College
5
4.5
100%
-0.6
+0.2
B
D+0.5
Hellenthal & Associates
5
8.2
40%
+3.4
+0.7
C+
D+0.4
Millersville University
5
14.1
80%
+7.2
+1.7
D
R+1.5
Greenberg Quinlan Rosner/American Viewpoint
5
4.4
100%
-2.8
0.0
B+
R+0.6
Ivan Moore Research
5
9.4
40%
+4.5
+0.9
C
D+1.3
Greg Smith and Associates
5
8.5
60%
+2.6
+1.1
C
D+1.2
International Communications Research, Inc.
5
3.1
20%
-1.6
+0.5
B-
R+0.1
Virginia Commonwealth University
5
4.9
100%
+0.8
+0.4
B-
R+0.3
Crawford Johnson & Northcott Inc.
5
4.6
100%
-3.0
+0.4
B-
D+0.1
DFM Research
5
6.3
80%
+0.5
+0.3
B-
D+0.9
Ed Renwick
5
6.5
80%
+1.1
+0.8
C
D+0.1
Clemson University
5
10.3
100%
-1.7
0.0
B
R+0.5
Middle Tennessee State University
4
8.0
100%
+0.9
+0.4
B-
D+0.1
University of Texas
4
1.2
100%
-5.0
+0.5
B-
D+0.1
Wirthlin Worldwide
4
4.6
75%
-0.8
+0.6
C+
R+0.5
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
Alabama State University
4
6.4
50%
-3.4
+0.5
B-
Elon University
4
4.0
50%
+0.7
-0.1
B+
D+0.4
Northern Arizona University
4
3.6
100%
-3.3
+0.5
B-
R+0.4
University of Arkansas
4
2.4
100%
-5.5
-0.4
A-
D+0.3
Optimus
4
13.3
50%
+5.0
+1.3
C-
R+0.8
University of North Florida
4
4.5
50%
-1.0
-0.3
B+
D+0.3
Fort Hays State University
4
23.8
50%
+9.3
+1.4
C-
Marshall Marketing & Communications
4
2.8
100%
-2.2
+0.5
B-
R+0.2
Minnesota State University Moorhead
4
9.3
100%
+2.0
+0.9
C
D+0.5
IVR Polls
4
4.0
100%
-2.2
+0.5
B-
Market Decisions
4
5.2
100%
-1.0
+0.2
B
R+0.1
Kimball Political Consulting
4
8.1
75%
+4.7
+0.8
C+
R+1.0
Consumer Logic
4
8.8
50%
+3.8
+1.1
C-
D+0.6
Richmond Times-Dispatch
4
3.3
100%
-1.1
+0.1
B
D+0.3
Southern Media & Opinion Research
4
6.4
100%
+0.9
+0.4
B-
D+0.0
Cole Hargrave Snodgrass & Associates
4
6.3
75%
-1.3
+0.1
B
D+0.3
Clarity Campaign Labs
4
3.2
63%
-0.1
+0.3
B
D+0.4
Political Marketing International, Inc./Red Racing Horses
4
4.3
63%
-1.2
+0.6
B-
D+0.1
Purple Strategies
4
3.0
88%
-1.2
+0.6
B-
R+0.4
Hill Research Consultants
4
5.4
50%
-0.1
+0.3
B
R+0.4
Philadelphia Inquirer
4
3.0
100%
-1.5
+0.1
B
R+0.3
Jim Meader (KELOLAND-TV)
4
4.6
100%
-0.3
+0.7
C+
D+0.5
Brigham Young University
4
16.5
75%
+7.2
+1.5
D+
D+1.9
OnPoint
4
1.7
100%
-1.9
+0.5
B-
D+0.2
Strategies 360
4
2.0
63%
-3.2
0.0
B
R+0.1
Scripps Howard
4
3.8
100%
-1.9
+0.5
B-
R+0.1
CallFire
4
3.9
75%
+0.6
+0.3
B-
R+0.5
Market Solutions Group
4
4.3
100%
-1.0
+0.6
C+
R+0.0
University of Wisconsin Milwaukee
3
5.3
100%
-1.5
+0.6
C+
R+0.5
Keating Research, Inc.
3
2.2
67%
-3.0
+0.1
B
R+0.0
TargetPoint
3
14.0
83%
+3.9
+1.1
C
Missouri State University
3
4.4
67%
-2.4
+0.1
B
D+0.4
PSI
3
12.5
67%
+2.5
+0.9
C
R+0.1
The Polling Company Inc.
3
3.7
100%
-1.5
+0.1
B
R+0.0
Knowledge Networks
3
4.1
100%
-1.1
+0.2
B
R+0.0
Wilson Perkins Allen Opinion Research
3
6.0
67%
-0.8
+0.2
B
R+0.3
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
Midwest Survey and Research
3
7.3
100%
-0.9
+0.6
C+
R+0.1
Manhattanville College
3
6.5
100%
-0.9
+0.6
C+
R+0.5
University of Iowa
3
15.9
67%
+5.0
+0.7
C+
R+0.2
Polling Company/Global Strategy Group (Hotline Bullseye)
3
4.6
33%
+2.0
+0.9
C
R+0.4
Dixie Strategies
3
7.9
83%
-0.9
+0.6
C+
CVOTER International
3
2.9
100%
-1.3
+0.6
C+
R+0.3
Braun Research
3
9.1
100%
+3.3
+0.6
C+
D+0.8
McCulloch Research & Polling
3
4.9
67%
-0.1
+0.7
C+
R+0.3
Decision Forecasting
3
8.1
100%
+1.6
+0.9
C
R+0.1
Data West Polling
3
14.6
33%
+7.0
+1.3
C-
D+1.3
Personal Marketing Research
3
6.2
67%
-2.2
+0.5
B-
Zimmerman & Associates/Marketing Intelligence
3
4.7
100%
+0.6
+0.8
C+
D+0.3
MSR Group
3
3.5
100%
-2.8
+0.5
B-
D+0.3
Illinois Wesleyan University
3
8.2
100%
+1.4
+0.8
C+
R+0.7
Castleton University
3
9.9
100%
-1.0
-0.2
B+
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
Iowa State University
3
6.3
67%
-3.5
+0.5
B-
US News & World Report
3
1.9
100%
-4.7
+0.5
B-
R+0.1
CPEC LLC
3
16.2
100%
+7.7
+1.4
D+
NPR
3
5.0
17%
+0.5
+0.3
B-
D+0.1
Christopher Newport University
3
6.8
100%
+0.7
+0.3
B-
D+0.6
Lycoming College
3
7.3
67%
+1.3
+0.8
C+
D+0.7
Clarus Research Group
3
6.8
100%
+0.8
+0.4
B-
D+0.5
Indiana University-Purdue University Fort Wayne
3
23.5
0%
+10.3
+1.2
C-
Dartmouth College
2
9.0
100%
-0.4
+0.3
B
Florida Atlantic University
2
3.7
100%
-1.3
+0.6
C+
Dane & Associates
2
21.2
50%
+13.1
+1.5
D+
R+1.3
StPetePolls.org
2
2.0
25%
-1.0
+0.7
C+
D+0.1
Loyola University (New Orleans)
2
12.1
100%
+9.6
+1.3
C-
D+0.8
Baselice & Associates, Inc.
2
10.0
100%
+4.3
+0.6
C+
D+0.2
McKeon & Associates
2
0.9
100%
-6.6
+0.2
B
R+0.0
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
Baruch College
2
5.7
100%
-0.1
+0.3
B-
RBI Strategies & Research
2
0.7
100%
-6.6
+0.2
B
R+0.0
Massie & Associates
2
23.9
0%
+14.4
+1.6
D+
R+1.5
Zata3
2
10.2
100%
+2.8
+0.9
C
R+0.2
Rice University
2
5.9
100%
+0.1
+0.7
C+
D+0.4
Ohio University
2
8.8
50%
+7.7
+1.2
C-
D+0.5
Merrill Poll
2
8.7
100%
-0.7
+0.2
B
SocialSphere
2
6.1
100%
+2.9
+0.5
B-
R+0.4
Belden Russonello
2
4.7
100%
+0.2
+0.3
B-
D+0.2
Frederick Polls
2
2.4
75%
-4.9
+0.2
B
R+0.0
University of Alabama
2
12.0
100%
+7.0
+1.2
C-
R+0.8
APC Research
2
2.5
100%
-3.5
+0.2
B
D+0.2
Cherry Communications
2
9.2
75%
+2.5
+0.9
C
R+0.1
Tulchin Research
2
3.5
100%
-3.2
+0.2
B
R+0.2
WCIA-TV
2
18.3
100%
+10.7
+1.4
C-
R+1.1
GBA Strategies
2
3.7
100%
-2.7
+0.2
B
R+0.2
M4 Strategies
2
3.1
100%
-6.2
+0.6
C+
R+0.2
MarblePort
2
5.6
100%
+0.5
+0.8
C+
R+0.2
TMR Research
2
7.8
0%
+2.0
+0.8
C
D+0.5
Basswood Research
2
10.7
100%
+0.6
+0.8
C+
R+0.4
Louis Harris & Associates
2
0.9
100%
-4.5
+0.6
C+
D+0.1
ResearchNow
2
9.4
100%
+0.8
+0.8
C+
Master Image
2
1.2
100%
-4.1
+0.6
C+
High Point University
2
0.9
100%
-5.6
-0.3
B+
D+0.0
Schapiro Group
2
20.0
100%
+5.0
+1.0
C
West Virginia Research Center
2
6.5
50%
+0.9
+0.8
C+
D+0.4
Forward Strategies
2
1.3
100%
-2.7
+0.6
C+
D+0.1
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+
Abacus Associates
2
12.1
50%
+4.9
+1.0
C
R+0.0
Texas Credit Union League
2
7.0
100%
-1.9
+0.6
C+
Indiana University
2
0.9
100%
-4.2
-0.3
B+
D+0.1
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
Kiley & Company
2
5.1
100%
-1.7
+0.2
B
D+0.2
CrossTarget
2
7.7
100%
+1.6
+0.8
C+
R+0.5
North Star Opinion Research/Ayres, McHenry & Associates
2
7.0
50%
+2.6
+0.5
B-
R+0.4
Fabrizio, Lee & Associates
2
5.9
50%
-0.4
+0.3
B
D+0.4
Bannon Communications
2
10.4
100%
+4.0
+1.0
C
D+0.6
Independent Market Research
2
5.7
100%
+1.7
+0.8
C+
D+0.3
Douglas Fulmer & Associates
2
5.1
100%
-2.9
+0.6
C+
University of Georgia
1
9.8
100%
+3.0
+0.8
C+
R+0.3
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
Ron Lester and Associates
1
18.9
100%
+3.3
+0.8
C+
R.L. Repass & Partners
1
11.2
100%
+1.2
+0.8
C+
University of South Florida
1
3.9
100%
+0.8
+0.8
C+
R+0.1
Rossman Group
1
4.2
100%
+0.6
+0.7
C+
D+0.1
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
Strategic Services
1
5.5
0%
+0.5
+0.7
C+
D+0.2
California State University, Bakersfield
1
9.8
0%
+3.9
+0.9
C
R+0.3
New Frontier Strategy
1
21.6
0%
+3.9
+0.9
C
Liberty Opinion Research
1
5.7
100%
+0.5
+0.7
C+
Cromer Group
1
3.9
100%
+0.4
+0.7
C+
R+0.1
Marketing Research Institute
1
7.4
0%
+4.6
+0.9
C
R+0.2
Saint Leo University
1
4.1
0%
+0.2
+0.7
C+
D+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
RABA Research
1
3.8
100%
-0.4
+0.7
C+
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
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
War Room Logistics
1
4.5
100%
-1.6
+0.7
C+
Rivercity Polling
1
6.7
100%
-1.7
+0.7
C+
R+0.2
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
Great Lakes Strategies Group
1
7.6
0%
+2.8
+0.8
C+
R+0.2
Winston Group
1
6.3
100%
-2.4
+0.7
C+
D+0.2
Red Sea Communications
1
4.4
100%
-2.4
+0.7
C+
R+0.1
Jeffrey Stonecash
1
17.3
0%
+10.7
+1.1
C
R+0.6
New Mexico State University
1
6.8
0%
-2.5
+0.7
C+
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
MBQF
1
4.3
100%
-2.9
+0.7
C+
Rainmaker Media Group
1
12.7
100%
+12.5
+1.1
C-
D+0.4
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
Central Surveys, Inc.
1
1.7
0%
-3.3
+0.7
C+
D+0.1
Neighbor
1
17.1
100%
+13.7
+1.2
C-
R+0.6
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
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
Canisius College
1
0.1
100%
-5.8
+0.7
C+
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
Feldman Group
1
10.8
0%
+3.7
+0.4
B-
D+0.3
Hoffman Research Group
1
7.1
100%
+2.2
+0.4
B-
R+0.2
Val Smith
1
8.5
100%
+2.0
+0.4
B-
R+0.3
Victoria Research & Consulting
1
8.1
50%
+1.0
+0.3
B-
D+0.3
University of Nevada Las Vegas
1
9.0
100%
+0.9
+0.3
B-
Probolsky Research
1
4.9
0%
+0.3
+0.3
B-
R+0.2
Schoen Consulting
1
2.3
100%
-0.7
+0.3
B-
R+0.1
Riggs Research Services
1
33.7
0%
+24.0
+1.5
D+
D+1.1
Old Dominion University
1
4.5
100%
-1.0
+0.3
B
D+0.1
Hampton University
1
3.5
100%
-1.8
+0.2
B
D+0.1
QEV Analytics
1
7.3
0%
-1.9
+0.2
B
Florida International University/Univision
1
1.8
100%
-5.7
+0.2
B
D+0.1
University of Houston
1
2.0
100%
-6.6
+0.2
B
Jayhawk Consulting
1
42.9
0%
+31.8
+1.8
D
D+1.4
Vanderbilt University
1
8.9
100%
+0.5
-0.1
B+
University of Florida
1
1.1
50%
-2.2
-0.2
B+
D+0.0
Diamond State Consulting Group
1
4.2
100%
-2.2
+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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