Sarah Palin is a Christian, baptized Roman Catholic, but has belonged to the Assemblies of God for quite a while. The Assemblies are a pentecostal denomination. Assembly of God website.

The Pew Forum has this biographical overview of Palin, along with links to articles on her religion.

The Pew Forum website also has this essay with statistics on pentecostalism.

So far, I think the most powerful member of the Assembly of God in Washington was Attorney General John Ashcroft.

Brief, preliminary thoughts: On the plus side, if Palin has internalized the Assemblies doctrines and ethos, she will be driven by a concern for right and wrong, not popularity. She will have a source of strength that may enable her to transcend the forces that shape people inside the Beltway. On the negative side, the Assemblies' doctrines and ethos do not lend themselves to compromise. The Assemblies, and pentecostalism in general, do not have the lengthy and sophisticated intellectual tradition regarding political practice that can be found within Roman Catholicism, Reformed thought, or Lutheranism. She will need to reach outside her tradition if she tries to think through to a well-developed Christian political worldview.

Perhaps someone will give her some of Reinhold Niebuhr's books.