If I ever had a bunch of spare advertising inventory, pro jury nullification would be the PSA I'd run. I wish someone would do a really catchy viral video about it. It wouldn't even need to run nationally; assuming jurors in many cases are drawn from the local county, you could blanket high-drug-prosecution counties with the message, information about how drug convictions don't actually solve the problems of the ghetto or drug abuse, etc., and probably be fairly effective.
As long as you do it before they are selected. Mark Schmidter got imprisoned for distributing jury nullification information to empaneled jurors; I'm not really into finding out what the worst possible judge things is contempt anywhere in the US.
I think you'd be a lot safer doing it from outside the jurisdiction of the court in question. I really don't know -- it seems like jury tampering/contempt of court have a lot of power and rely on the judge being not an utter tool, which often breaks down. Going to jail and eventually winning some legal challenge is something I'd personally consider a failure, but others are willing to do.
