We've had 40 years of Democratic capitulation and complicity with austerity, deregulation, tax cuts, and negligence toward the core issues that matter to their base such as voting rights, abortion, and LGBT+ rights.
Simultaneously, Democrats have pursued white centrist and conservative voters, embracing hard right policy on immigration, for example.
As the GOP has become radicalized, Democrats have normalized previous extremists like Bush and Cheney, trying to "outflank" from the right.