Why is Sarah Palin so against everything Obama does?

It's one thing to not like a decision here or there, but she disagrees with everything he does all the time. You never hear her say "I like this but you could possible change this hear" or " I like some of the things your doing." It seems like any decision Obama makes its wrong, no matter what. I bet if Obama said Someday I want peace and prosperity for everyone she would say "no" just simply in spite of?