It is important to remember the dynamics of a whip count. It is a tool of political gamesmanship and often a very bad idea when faced with a bill that has a slim majority or hard won support.
It is easy in the process of a whip count - that a legislator knows will be anonymous - to say NO. Legislators have no accountability and by saying NO they can help to kill the possibility that they will have to face a tough political choice.
There is a huge difference in being asked where you stand in a secret whip count and facing how you will vote when the moment comes and everyone is watching.
We saw this dynamic in San Diego with the Mayor. The Day Before he was still publicly pledging to veto the Marriage resolution if it came to his desk -- perhaps hoping his longstanding pledge of opposition would keep the matter from reaching him at all. But having reached him, the decision before him stopped being gamesmanship or being driven by fear of a backlash.
His decision became clear and human and courageous.