So far, it's been mum's the word on whether she will run for president, but Sarah Palin knows one thing for certain: there's fire in her belly.

Appearing on Fox News Thursday night, the former Alaska governor told Greta Van Susteren that while she hasn't decided if she is going to make the official leap into a campaign, the inner drive to do so is there.

I'm so adamantly supportive of the good, traditional things about America and our free enterprise system, and I want to make sure that America is put back on the right track, Palin said. We'll do that by defeating Obama in 2012. I have that fire in my belly.