New Jersey's largest gay rights advocate is calling on Governor Chris Christie to “evolve” on the issue of gay marriage.

Last year, Christie, a Republican, vetoed a bill approved by lawmakers legalizing such unions in the state. Christie said that the issue “should be left to the people of New Jersey to decide.”

Democratic leaders have vowed to override the governor's veto but have also conceded that they don't have the two-thirds majority required to do so.

A new petition campaign launched Thursday by Garden State Equality aims to change the governor's stance on the issue.

As of Friday morning, more than 2,000 people had signed on to the 3-sentence petition.

“Governor Christie, it's time to evolve,” it states. “Marriage equality is no longer a single-party issue. Please support the freedom to marry for all New Jersey families.”

(Related: Sixty-four percent of New Jersey voters support gay marriage.)