The PRD is no longer a party, nor does it behave as one.
He later says that the party "has renounced politics," and goes on to discuss how the party's embrace of extralegal obstructive tactics --first against political enemies, later against ideological allies as well-- has led to its self-immolation. (I made a similar argument a few months ago.) Last week, the López Obrador crowd forced the party's national meeting out of its headquarters with a blockade of the entrance. Again, this was a protest of their fellow perredistas. Now, there are two sides with swords drawn and almost zero hope of reconciliation. Such a result was perhaps not inevitable, but it certainly was a predictable consequence for the continued backing of López Obrador. If you're not a democrat, a democracy's probably not the place for you.