New Jersey isn't Massachusetts.
New Jersey doesn't have an old blue law law that prohibits marrying people from other states. So if marriage were to become legal any couple from any state could travel there, get married, and then go home and file suit in their homestate. Granted this will probably result in more anti-gay marriage state amendments than gay marriage becoming legal nationwide, not to mention all the states that have already banned same-sex marriage in their state constitutions. However, it could lead to the first real legal challenge to DOMA-- constitutional crisis anyone?