That really needs to be pointed out.
I'm sure the 3 would be absolutely thrilled if their troublemaking even qualified as a little "squabble," but how could it? I guarantee you the others are much too busy getting ready for 2021 and also far too smart to gratify their desire for attention.
Except for Manchin, riding the ideological knife edge in WV, who finds throwing an over-publicized nya-nya at the tiny socialist trio useful for appeasing the trumpists in his district. Their exchanges of shafts benefit them all, and don't they all know it. 
As for the 200 or so total from our two ideologically liberal progressive (!) caucuses, they're still extremely unified in goals and against the Republicans, just differing on details. Many are currently maneuvering for committee assignments and leadership positions in the 117th congress, as they do every 2 years, and there are some sharp words and elbows being thrown among themselves there. Of course.
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