Memo to Sarah: Write the book(s) first, then go on Oprah, Letterman, Leno, etc. That way you can generate some coin for your 2012 run, and hawk your book at the expense of Oprah, Dave and Jay.
That would be a legitimate way to go on the talk shows. Hawking a book with some serious content would be better than just going on Oprah ad hoc. Like you said. she could make some money at the same time. Maybe next year, when the book is published and #1 on the best seller list would be ok.