I don't know Dolan's position on it (other than he's always been against it due to abortion coverage...but what would his position be w/o abortion? Don't know for sure)
Not all of the Bishops supported it, though. There were many of them who came out in opposition to it because of the principle of subsidiarity. Archbishop Neumann (KC KS) and Bishop Finn (KC MO) issued a long statement on it. Archbishop Chaput (formerly Denver, no Phila) spoke at length about it, as did Archbishop Nienstedt (St Paul), Bishops Nickless (Sioux City), Doran (Rockford), Slattery (Tulsa) and Johnston (Springfield-Cape Girardeu) also spoke eloquently as well. Salvation has the list and I have pinged her.
Like I said, though, not sure where Dolan was (other than he would have been opposed due to abortion coverage).
I'd like to know what percentage backed it and what percentage were against it.