The group Cures Without Cloning says it has not yet begun gathering petition signatures for its amendment. The group says it’s waiting on an appeals court challenge to the ballot language.

Even if the appeals court were to rule immediately, supporters of the ballot proposal would face a steep challenge to gather about 150,000 signatures in less than three weeks.

The proposal would change the definition of "human cloning" to prohibit a type of research in which a human embryo is cloned and then destroyed in a lab dish when its stem cells are removed.