1. They criticize the President and the Party leadership - Especially if the criticisms sounds legitimate, since this will demoralize the base and ultimately reduce voter turnout.

2. They defend the President and the Party leadership. Thus showing that they are serving the interest of the corporate elitist by shielding our elected leaders from the pressure necessary to actually enact progressive change and to keep the Democratic Party viable in the long run.

3. The most devious of all are those who perform a sly combination of criticizing and defending the President and the Party leadership. Clearly this is the most sinister of all characters. They are attempting to both demoralize the base while shielding the elected leaders from the pressure necessary to enact progressive change.

If you find ANYONE performing either of these two roles or a combination of both - you know - you know for absolute certainty that you are dealing with a professional Republican troll.