Gallup
3050 RV
+/-2
47
46
1 Sept
ABC News/Wash Post
857 RV
+/-4
46
47
25 Aug
CNN/Opinion Research
719 LV
+/-3.5
49
42
23 Aug
Gallup
3050 RV
+/-2
45
47
21 Aug
Gallup
3050 RV
+/-2
46
46
11 Aug
Gallup
3050 RV
+/-2
47
45
1 Aug
Pew Research
1956 RV
+/-3.2
51
41
26 July
Gallup
3050 RV
+/-2
46
46
25 July
CBS News/NY Times
942 RV
+/-3
46
47
16 July
Gallup
3050 RV
+/-2
47
44
11 July
Reuters/Ipsos
885 RV
+/-3.4
49
43
9 July
Pew Research
2373 RV
+/-2.3
50
43
9 July
ABC News/Wash Post
1003 RV
+/-4
47
47
8 July
CNN/Opinion Research
1390 RV
+/-2.5
49
46
1 July
Gallup
3050 RV
+/-2
48
43
28 Jun
Pew Research
1563 RV
+/-2.9
50
46
17 Jun
Gallup
3050 RV
+/-2
45
46
14 Jun
Reuters/Ipsos
848 RV
+/-3.4
45
44
11 Jun
Gallup
3050 RV
+/-2
46
45
8 Jun
Pew Research
2388 RV
+/-2.3
49
42
3 Jun
CNN/Opinion Research
895 RV
+/-3.5
49
46
31 May
Gallup
3050 RV
+/-2
47
44
30 May
ABC News/Wash Post
874 RV
+/-4
49
46
20 May
Gallup
3050 RV
+/-2
45
46
17 May
CBS News/NY Times
562 RV
+/-4
43
46
13 May
Gallup
3000 RV
+/-2
44
47
9 May
Reuters/Ipsos
959 RV
+/-3.2
49
42
7 May
The BBC poll of polls uses the same methodology as the London School of Economics, known as the median smoothing method.
Looking at the five most recent polls it takes the middle value for each candidate, ie, the value which falls between two figures that are higher and two figures that are lower.
The data was collated by polling resource website Real Clear Politics. RV indicates those polled were registered voters. LV indicates a sample of likely voters.
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