From C-SPAN's Washington Journal interview with Newt Gingrich Sunday morning:
C-SPAN: "If you were to run, what factors would you take into account? What would lead you to think about running?"
GINGRICH: "Callista and I are going to think about this in February 2011. And we are going to reach out to all of our friends around the country. And we'll decide, if there's a requirement as citizens that we run, I suspect we probably will. And if there's not a requirement, if other people have filled the vaccum, I suspect we won't."