There are, but not like that.
I don't know. It would be hard to find a judge that would make such a ruling here. Inside the courtroom bringing up jury nullification would earn an almost instant contempt of court charge. But outside of the courthouse? I do not think so. And after searching a while it looks as long as one is on the public sidewalks one can hand out pamphlets or hold up signs in the US. If there are such pamphleteers outside and a judge knows of it he may ask potential jurors if they had any contact with anyone and they can be excluded from the jury for that, but the people outside appear to be legit. They are told to hand out their materials to everyone and non concentrate on just potential jurors. When they do it that was it appears to be a First Amendment protected activity. Please note, I could not find any sources saying that this is not allowed and this is from a biased source for that sort of activity:
Not legal advice, but general observations that might be of use for those trying to weigh the risks of hand out jury nullification brochures or hold a sign outside a courthouse.
fija.org