These stories get started by some pundit 'wondering' if Hillary 'might' run, if Obama seems shaky, then several OTHER pundits chime in, saying "It is being asked whether....", and soon there are 20 sources, all quoting each other or "unnamed sources".

So far, I have seen NO credible answers from anyone who is likely to really have any evidence that such a thing is possible. Somtimes this is merely a 'trial balloon' be interested parties to see what the response is to planting the story.

*I* happen to think that if she actually challenged Obama, the negative publicity would be a disaster....