You're right, but the strange thing is, they shouldn't. This ruling protects all forms of peaceful dissent and the expression thereof. The liberals were mad because they are for all forms of protest, as long as it is protest they favor. If it was protest against the liberal line, they were more than willing to misapply the RICO statutes and other laws to stifle it (the hypocrites).
Even Alan Colmes, bless his liberal bleeding heart, recognized this. Hey, I like Colmes, for some strange reason (but I didn't say I agree with him)...