My guess is if Cain is somehow driven from the campaign and it is a Romney vs Obama race, there WILL be a third party campaign and that Sarah and perhaps even Cain will be a part of it.
That said, here's hoping that Cain can prevail and secure the GOP nomination because I think that is our best shot to not only end the Obama presidency but to advance the conservative cause in a very significant manner.
The front runners always get attacked. This is nothing new and not unique to Cain. Get used to it.