it would have to be something more than polling.
Polls this far out from a presidential race mean just about nothing. Reagan trailed carter by 17 points in spring 1980.
I can believe the family issue, and also the fact that she would run effectively against the GOP, national media, and Democrats, and even if she won, she would not have enough of her supporters even in GOP to do much. Also she may have felt like money would be an issue and there might be continuing lawsuits in AK and legal abuse against her family.
What i dont understand is why she waited this long to say no. But it is what it is.
Obviously from reading FR, her credibility and reputation have taken a hit. I hate to speculate about the future. I do hope though she can effectively argue for American to develop our own resources instead of paying foreigners for theirs.