I wonder if Gallup is even worth discussing. It's amazing how closely they numbers are following the same pattern it did during the 2000 elections. At this time, in 2000, Gallup had Bush ahead by 51-40 margin.
You can check the details on 2000 pre-election polling on this Polling Report page.
The Gallup numbers for 2000 are in the extended section.
Date Gore Bush
11/5-6/00 46 48
11/5-6/00 45 47
11/4-5/00 45 47
11/2-4/00 43 48
11/1-3/00 43 47
10/31-11/2/00 42 48
10/30-11/1/00 43 47
10/29-31/00 43 48
10/28-30/00 44 47
10/27-29/00 44 47
10/26-28/00 42 49
10/25-27/00 42 49
10/24-26/00 39 52
10/23-25/00 42 49
10/22-24/00 43 48
10/21-23/00 46 45
10/20-22/00 44 46
10/19-21/00 41 50
10/18-20/00 40 51
10/17-19/00 40 50
10/16-18/00 39 49
10/15-17/00 42 48
10/14-16/00 44 47
10/13-15/00 44 47
10/12-14/00 43 48
10/11-13/00 44 48
10/10-12/00 45 45
10/9-11/00 45 44
10/8-10/00 45 45
10/7-9/00 44 47
10/6-8/00 42 50
10/5-7/00 41 49
10/4-6/00 41 48
10/3-5/00 45 44
10/2-4/00 51 40
10/1-3/00 49 41
9/30-10/2/00 46 44
9/29-10/1/00 45 45
9/28-30/00 45 45
9/27-29/00 46 44
9/26-28/00 44 46
9/25-27/00 46 46
9/24-26/00 44 46
9/23-25/00 44 46
9/22-24/00 44 47
9/21-23/00 46 47
9/20-22/00 48 45
9/19-21/00 50 42
9/18-20/00 51 41
9/17-19/00 49 43
9/16-18/00 48 44
9/15-17/00 48 43
9/14-16/00 49 41
9/13-15/00 48 42
9/12-14/00 49 42
9/11-13/00 49 42
9/10-12/00 49 41
9/9-11/00 48 42
9/8-10/00 49 42
9/7-9/00 47 44
9/6-8/00 45 46
9/5-7/00 46 43
9/4-6/00 47 44
8/24-27/00 45 46
8/18-19/00 47 46
8/11-12/00 39 55
8/7/2000 43 45