View HuffPost's Senate forecast
Poll Chart
2016 Iowa Senate: Grassley vs. Judge
This chart combines the latest opinion polls into trendlines using a poll-tracking model and is updated whenever a new poll is released.
HuffPost Model
Our model of the polls suggests Grassley was very likely leading. (In >99% of simulations, Grassley led Judge.)
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Latest Polls
Poll | Grassley |
Judge |
Other |
Undecided |
Spread |
---|---|---|---|---|---|
Nov 1 – Nov 7, 2016
1,781 Likely Voters
|
57 | 39 | 4 | Grassley +18 | |
Nov 1 – Nov 4, 2016
800 Likely Voters
|
56 | 33 | 2 | 10 | Grassley +23 |
Nov 1 – Nov 3, 2016
500 Likely Voters
|
53 | 37 | 1 | 8 | Grassley +16 |
Oct 25 – Oct 31, 2016
984 Likely Voters
|
56 | 41 | 3 | Grassley +15 | |
Oct 20 – Oct 26, 2016
791 Likely Voters
|
56 | 38 | 0 | 5 | Grassley +18 |
Oct 8 – Oct 16, 2016
1,135 Likely Voters
|
56 | 40 | 5 | Grassley +16 | |
Oct 7 – Oct 10, 2016
917 Likely Voters
|
51 | 39 | 11 | Grassley +12 | |
Oct 3 – Oct 6, 2016
642 Likely Voters
|
53 | 36 | 2 | 9 | Grassley +17 |
Sep 20 – Sep 22, 2016
491 Likely Voters
|
54 | 37 | 1 | 9 | Grassley +17 |
Sep 13 – Sep 21, 2016
612 Likely Voters
|
55 | 43 | 0 | 2 | Grassley +12 |
Sep 12 – Sep 14, 2016
404 Likely Voters
|
56 | 39 | 2 | 3 | Grassley +17 |
Sep 6 – Sep 8, 2016
1,054 Likely Voters
|
50 | 37 | 13 | Grassley +13 | |
Aug 30 – Aug 31, 2016
827 Likely Voters
|
49 | 43 | 8 | Grassley +6 | |
Aug 17 – Aug 19, 2016
987 Likely Voters
|
45 | 38 | 1 | 15 | Grassley +7 |
Aug 9 – Aug 16, 2016
846 Likely Voters
|
51 | 42 | 0 | 6 | Grassley +9 |
Aug 8 – Aug 10, 2016
500 Likely Voters
|
52 | 42 | 6 | Grassley +10 | |
Aug 3 – Aug 7, 2016
899 Registered Voters
|
52 | 42 | 1 | 5 | Grassley +10 |
Jul 13 – Jul 15, 2016
998 Likely Voters
|
45 | 37 | 2 | 16 | Grassley +8 |
Jul 8 – Jul 11, 2016
401 Likely Voters
|
52 | 42 | 6 | Grassley +10 | |
Jul 5 – Jul 10, 2016
822 Registered Voters
|
52 | 42 | 1 | 5 | Grassley +10 |
Jun 24 – Jun 28, 2016
600 Likely Voters
|
46 | 45 | 10 | Grassley +1 | |
Jun 22 – Jun 23, 2016
897 Likely Voters
|
46 | 39 | 14 | Grassley +7 | |
Jun 9 – Jun 13, 2016
630 Likely Voters
|
48 | 41 | 11 | Grassley +7 |