See who's ahead in our 2020 national polling averages 📈

UPDATED Sep. 29, 2020, at 1:40 PM

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Who’s ahead in Iowa?

Updating average for each Democratic candidate in 2020 primary polls, accounting for each poll’s quality, sample size and recency

Our average includes all candidates that FiveThirtyEight considers “major.” Candidates with insufficient polling data are not displayed in the averages. State polling averages are adjusted based on national trends, which means candidates’ averages can shift even in the absence of fresh state polls. Read more about the methodology.

Added Sept. 24, 2020

DatesPollsterSampleResultNet result
U.S. Senate
U.S. Senate
IowaIowa
Sep 18-22, 2020
402 LV
Sep 18-22, 2020
402LVGreenfield
48%

Greenfield

48%

Ernst

47%

Stewart

1%

Herzog

0%
MoreGreenfield+1
U.S. Senate
IowaIowa
Sep 18-22, 2020
402 LV
Sep 18-22, 2020
402LVGreenfield
49%

Greenfield

49%

Ernst

46%

Stewart

1%

Herzog

0%
MoreGreenfield+3
U.S. Senate
IowaIowa
Sep 18-22, 2020
402 RV
Sep 18-22, 2020
402RVGreenfield
47%
Tie

Greenfield

47%

Ernst

47%

Stewart

1%

Herzog

0%
MoreEven
U.S. Senate
IowaIowa
Sep 16-22, 2020
501 LV
Sep 16-22, 2020
501LVGreenfield
42%

Greenfield

42%

Ernst

40%

Stewart

2%

Herzog

2%
MoreGreenfield+2

Key

A = ADULTS

RV = REGISTERED VOTERS

V = VOTERS

LV = LIKELY VOTERS

Sept. 19, 2020

U.S. Senate
U.S. Senate
IowaIowa
Sep 14-17, 2020
658 LV
Sep 14-17, 2020
658LVGreenfield
45%

Greenfield

45%

Ernst

42%
42%
ErnstGreenfield+3

Sept. 10, 2020

U.S. Senate
U.S. Senate
IowaIowa
Aug 30-Sep 5, 2020
800 LV
Aug 30-Sep 5, 2020
800LVGreenfield
45%

Greenfield

45%

Ernst

50%
50%
ErnstErnst+5

Aug. 18, 2020

U.S. Senate
U.S. Senate
IowaIowa
Aug 13-14, 2020
729 V
Aug 13-14, 2020
729VGreenfield
48%

Greenfield

48%

Ernst

45%
45%
ErnstGreenfield+3

Aug. 6, 2020

U.S. Senate
U.S. Senate
IowaIowa
Jul 24-Aug 2, 2020
1,101 LV
Jul 24-Aug 2, 2020
1,101LVGreenfield
45%

Greenfield

45%

Ernst

43%
43%
ErnstGreenfield+2
U.S. Senate
IowaIowa
Jul 27-30, 2020
500 RV
Jul 27-30, 2020
500RVGreenfield
40%

Greenfield

40%

Ernst

36%
36%
ErnstGreenfield+4
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