The Democrats lost because they ran a weak and out of touch campaign
"Once given the reins of the party, the vice-president ran a campaign that was in both style and substance – like today’s Democratic party as a whole – driven by the professional class. Weakly populist ads targeted to swing states sat uneasily with attempts to make the race about abortion rights or Trump’s contempt for democracy. There was no unifying economic message that blamed elites for the country’s problems and laid out a credible vision of change. People knew that Harris was not Trump, but they didn’t know what she was going to do to solve their problems. She had the burden of incumbency without its benefits."
read more>>
The Democrats lost because they lost workers | Bhaskar Sunkara | The Guardian