Why Aren't Sarah Palin's Kids in School?

I'm upset that Sarah Palin's kids are on the campaign trail with her instead of being in school.  Especially Bristol.  She's a senior in high school, and I think Sarah should show everyone how important graduating from high school is. Instead, she's having her campaign with her. I don't understand this. I really don't.  She's putting her campaign ahead of her kids' schooling.  

I really believe in home schooling, since so much that is taught in school these days is problematic.  But I don't think Sarah is homeschooling her kids.  She's just showing them off to the country for her benefit.  

There are some things I like about her -- the fact that she has stood up to corruption and really tried to change things in Alaska.  But I just don't respect her choices with her family.