With O'Bastard it's easy. He said in one of his memoirs that he'd side with the Moslems, and he's never gone against that. He's a Moslem but he denies it so we know he is a liar. He likes being an Authoritarian so Communism is a good fit too.
The Clintons are liars too, but they keep a sharp eye on which way the winds are blowing. They commissioned polls to decide where to take vacations! Apparently they have decided communism is polling well enough to not trash it, but wait and see if the commies that have won Primaries can win General Elections. They probably will in places like New York, so the foot is in the door there, but can they win elsewhere? Maybe, maybe not.
So neither set of grifters aren't going to stick their necks out yet. Not until November. They can't admit it, but they have to know the Democrats could lose, and lose big.