I think Condi Riced has the potential. But '08 may be too soon for her, unless she becomes VP in '04. She also may not want to be a politician, but prefers to be more behind the scenes.
One reason I like Condi also is the fact that she is black which will make it more difficult for Dems to beat her up, as they would anyone else.
She is also a lot easier on the eyes then old Hill.