It's in fact the opposite: the jury is explicitly told to judge the case, not the law, and mentioning nullification as a juror will certainly get you thrown out during the selection process, and I've even heard of cases which were sent to mistrial when the jury's intent was revealed. The best way to successfully nullify is to pretend that you've never heard of such a thing.

I do hope there's a demographic shift here. Facing heavy-handed laws regarding drugs and such, web-savvy young people seem to be slowly catching on about tactics like nullification, not talking to police, etc.