Yeah that's kinda what I suspected, the pollsters seem more precise in the demographics of the sample they're polling.
FT also points out what I've said repeatedly on this site, nearly all of the polls that showed Hillary up also showed her below 50% of the total vote and a substantial amount of undecided voters. This year there's a lot of polls that show Biden above 50% and an overall significantly lower amount of undecided voters.

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