Sarah needs to do some historical reading and boning up on the issues, and she'll be fine. She's got four years to do it.
The fact that someone in her age (mid-40s), and in her position has to bone up on these things is a strong signal that she's just not cut out for the job.
It shows she lacks curiosity and passion about public policy and political philosophy. In other words, it means she's a lightweight, and I don't want someone like that to be president.