Just from what is public knowledge about MN, I would vote for her for the following reasons.....
1] she is honest and forthright. Always was and always will be. Gee, now, wouldn't that be a novelty in politics.
2] She is generally well informed and has always had strong convictions. Animal rights, Womens rights, WTA, gay rights, environmental issues. She has always had a considered view wrt these and other issues, even when she was not looking at politics as a career. I dont agree with everything that she thinks.. (Im not convinced that PETA are always a good organization frinstance) but im impressed that she has used her notariety to comment about non-tennis issues that she cares about.
3] She is successful and wealthy enough not to be motivated solely by greed while in office.
4] She has shown dogged determination and committment in her tennis, and I see no reason for her not to apply this to other area of her professional life.
5] She has seen both sides of the fence. poor in czechoslovakia, rich in the USA, hated early and liked later. That kind of experience gives you perspective. A minority view is a good view, IMO.