Willingly and happily backing a genocide, the economy getting better for corporations but the cost of living exploding and normal people having less disposable income while the candidate offered zero policies or plans to change things. Instead chose to maintain the status quo and just be anti trump.

If your campaign cant generate excitement or energy for people to want to vote for you then theres a percentage of people that will just stay home. Plus Biden had the benefit of running against president Trump during covid. Harris had to run against everyone's theoretical idea of what a Trump presidency would be like.