Biden is leading among female registered voters by 59% to 35%, a 25-point margin when the numbers aren’t rounded. That’s a significant increase from his 19-point advantage earlier this year and the 14-point lead Hillary Clinton had in the final 2016 preelection polls of registered voters. Clinton had a 13-point edge with likely female voters.
We can go back even further. Prior to 2016, Gallup would take its final preelection poll and readjust it to match the final margin. I look to Gallup to make the closest apples-to-apples comparison (i.e preelection polling to preelection polling) that we can make.
The only year that comes close to what we see in the polls right now is 1964. That year, Democrat Lyndon Johnson won nationally by 23 points overall, and Gallup had him taking the women’s vote by 24 points. Biden’s doing a point better than Johnson did among female voters, even as he is doing 13 points worse overall. In no other year since 1952 did the Democratic nominee win among female voters by more than 15 points.