They prevent liberation by selling you back your chains with populous rhetoric and slogans
(europe.pub)
While I won’t argue that this has often been the role of the Democratic Party, and I have no doubt that it is a priority of the current party leadership, it is not an inherent function of the party. With our current electoral system, it is inevitable that our politics will be dominated by two parties. Republicans are the worse choice of the two on literally every single issue, including being less open than Democrats to changes to the electoral system itself. The solution, as leftists, is not to abandon the Democratic Party, but rather to take it over from within and elect party leadership focused on real change and not upholding the status quo. This approach is much more feasible and potentially much faster than trying to build a new party from the ground up, and much less destructive and painful for the people than violent revolution and the civil war that would likely ensue.