After the way that the Obama campaign treated her I doubt seriously she'll be pulling the lever for the O man. She may not vote for McCain but she more than likely will not be voting for Bambi.
I don't know how the Obama campaign treated her, but it seems she was snubbed in some way. Perhaps you are right, and she will not vote for anyone. Still, since she predicted that many Democrat women will vote for a McCain/Pallin ticket, Ferraro must carry some weight with voters. It might seem like she is giving them a clear conscience to vote that way.