You can tell by how the DNC bent over backwards to accomodate Sanders and his campaign, even changing the plan to get rid of the Iowa Caucus as the first primary election since Sanders thought it would favor him in 2019. (Then Buttigieg won it instead)
And the established dem party learned from their mistakes. It will be much tougher to slide a progressive by again.
You can tell by how the DNC bent over backwards to accomodate Sanders and his campaign, even changing the plan to get rid of the Iowa Caucus as the first primary election since Sanders thought it would favor him in 2019. (Then Buttigieg won it instead)