Barack Obama wanted to endorse gay marriage on his own timetable. Joe Biden had other plans.

Over the last several weeks, dozens of lawmakers, strategists and advocates described the closed-door meetings and tactical decisions that led to approval of same-sex marriage in New York, about two years after it was rejected by the Legislature. This account is based on those interviews, most of which were granted on the condition of anonymity to describe conversations that were intended to be confidential.