But, and this is the important part, you SHOULD NOT say nullification is your reason to vote not-guilty. Otherwise the judge might (and they sometimes do) remove that juror and replace him with an alternate.
Just say "The prosecution has not proved their case beyond my reasonable doubt". And nothing more.
Or you could say: "This law is morally repugnant and I cannot n good consciousness vote to convict someone under it."
If the judge tries to dismiss you after hearing that, file charges and prosecute him for deprivation of rights under color of law.
Whoever, under color of any law, statute, ordinance, regulation, or custom, willfully subjects any person in any State, Territory, Commonwealth, Possession, or District to the deprivation of any rights, privileges, or immunities secured or protected by the Constitution or laws of the United States, or to different punishments, pains, or penalties, on account of such person being an alien, or by reason of his color, or race, than are prescribed for the punishment of citizens, shall be fined under this title or imprisoned not more than one year, or both; and if bodily injury results from the acts committed in violation of this section or if such acts include the use, attempted use, or threatened use of a dangerous weapon, explosives, or fire, shall be fined under this title or imprisoned not more than ten years, or both; and if death results from the acts committed in violation of this section or if such acts include kidnapping or an attempt to kidnap, aggravated sexual abuse, or an attempt to commit aggravated sexual abuse, or an attempt to kill, shall be fined under this title, or imprisoned for any term of years or for life, or both, or may be sentenced to death.