New Jersey’s best-known gay rights activist is leaving his post at the helm of Garden State Equality, the organization he founded more than eight years ago. Steven Goldstein says he’s going to work later this month as associate chancellor for external relations at Rutgers University-Newark. With Goldstein as its leader, Garden State Equality used legal action and lobbying to push for gay marriage in New Jersey. Last year, the Legislature passed a law to legalize it, but it was vetoed by Gov. Chris Christie.