Of course, the other possibility of a Hillary victory is if the Republican candidate just isn't ready for prime time. The only possible candidate on either side who has been throughly vetted is Al Gore and to a lesser degree John Edwards. Like him or not, Al Gore did run a very viable campaign in 2000 and came frightfully close to winning. I still think Gore is the most viable candidate the Democrats could run.
I think Algore could win, no matter who the 'Pubbies run.
But it would be hard to run a viable primary campaign without ever getting on an airplane. And Algore knows better than to get on an airplane if he's running against Hillary!.