Who is they? Both parties have donors they own favors to and both sides try and find ways to manipulate elections.

The Republicans love gerrymandering and intimidating voters. What the DNC (they) is doing by refusing to hold Democratic debates is rig who will be the DNC candidate. I am not sure why you would question this?

They (DNC) want Biden, and they are unwilling to allow him to win it outright by putting him on a stage with other Democratic challengers. Doing this is to rig it for the outcome they want.

I am sorry you continue to have faith in the DNC. I have lost mine. The best that can be said about them is they are not Republicans.