It’s really more simple than that.
Think about it.
Silver doesn’t want to talk about analysis or reality.
All he wants is to stay in good with the left.
They won’t blame it on him when zero loses.
But I guarantee you that if he even reluctantly picked Romney or called it a toss up then the left would be finished with him from now on.
Always keep in mind the individual’s personal goals and ambitions when listening to this stuff.
That said, he has to get it close at the end to preserve his reputation.. If he doesn't start to close soon, that isn't going to happen.. UNLESS, he believes, with something that assures himself, that he has solid ground that he is being told, to his satisfaction..