While I certainly think it’s useful to analyze things like turn out amongst various demographics, I really think that the reason that the Democrats lost is as simple as 1 – 2–3 (in this order):
1. Inflation and high prices.
2. Worldwide trend of unseating incumbent administrations in 2022-2024 in the aftermath of the pandemic.
3. Kamala Harris was unpopular amongst pretty much every demographic except for staunch liberals.
There’s nothing they could have conceivably done to alleviate number one and number two, and once Joe Biden stepped down, there was nothing they could have realistically done besides run Harris. It was the right call, it just did not work out. It happens.
In 2026 and 2028, they need to drop all of the social stuff and focus almost entirely on 1. the rampant unaffordability of literally everything, but especially housing, and 2. cleaning up the corruption in Washington. They need somebody like Andy Beshear, who has been a very popular and exceptionally successful blue governor in a deep red state, at or near the top of the ticket.