Ann Althouse notes that some of the protesters are starting to lose it:

I see some people descending into irrationality — beginning to form a cultish mentality that demonizes outsiders. Meade was at a demonstration, photographing it. A demonstration is — to a clear-thinking person — a collection of people asking to be seen, wanting to be photographed. Yet when they perceive that Meade isn’t one of them they flip — it’s a Flip camera — into fear. Meade had been trying to talk to them rationally about why the pro-Walker woman might not want to debate her ideas in that setting, and instead of seeing Meade as a citizen who’s finding out what’s going on and helping 2 women who are surrounded and outnumbered, they spread their “plant” theory. And it’s not just a theory. They know he’s a plant.

Context?  Sure – read the piece.