You may be right, but if that was the intent, it hasn't worked that well at DU. When I looked at their thread a few hours ago it hadn't been updated for a couple hours and the enthusiasm was, well, tepid. Some loved it, some were unsure whether the threat was enforceable, and others were concerned about how such a demand could affect their rights. Not the kind of response one would want from a fired-up base.
I am sure there is plenty of glee in moveon land, but these tactics should backfire with well-reasoned people. Stifling free speech is never a good idea because it can cut both ways. I am sure some of it may be testing of the waters for the fairness doctrine. HR3303 is in the background as well. This story would have been dead and in bed today most likely so resurrecting it plays no role other than to intimidate (which didn’t work) and fire up the minions which from DU’s standpoint didn’t do too much.