I dont think that matters much. 82% for black voters and 51% for voters under 30 are not good numbers for a Democrat Presidential nominee.That signals many black voters and young progressive voters will be staying home or voting Green Party or West.
Clinton couldn't turn out her base with Bernie Bros voting for Stein, Harris doesn't have that problem And there was this https://fivethirtyeight.com/features/the-comey-letter-probably-cost-clinton-the-election/
He probably lost some, following his bleach injection advisory. You might say they made a clean break.
Harris's problems are even worse.Jill Stein and Cornel West are polling double what Jill Stein did in 2016.Only around 80% of black voters say they will vote for Harris compared to 89% who voted for Hillary.25% of black men under 50 say they are voting for Donald Trump.Harris's favorbility with young voters is only 50%,most of these voters are left wing. Jill Stein is polling higher than Harris with Muslim voters in Michigan,Wisconsin and Arizona.Harris is polling 1 point lower than Clinton was against Trump.Harris is polling 5 points lower than Biden was against Trump.These problems are much bigger than Clinton's were.
It's possible that you haven't seen this Gallup September favorability poll. Look at past years compared to this year.
Trump is polling better against Harris than he did Hillary. Democrats have not not only gained support since 2020,polls show lost they tons of it.