Best For Sarah to bide her time.
I don't think it's too late for Sarah to get in and be successful. I think she is gauging how Perry will fare and will only make the leap if he falters - I would expect her to endorse him at the right time (not too early, just "in case") and would hope that he would provide the same courtesy if he does screw up enough to require another candidate. She is content to have a capable, reasonable hand at ther helm and knows she can also provide pressure from without if he loses his direction. We owe any real hope we have to Sarah Palin for at least this election season and probably for the next 3-5 down the road.