I'm tempted to say Biden (if he runs) or another Democrat with ties to the Obama administration could beat her in a primary...
As for the general she's vulnerable to any Republican that's not Rand Paul, Ted Cruz or Allen West... and she loses to Huntsman, Walker, Rubio, and Ryan and Bush.
Uh...if you think Hillary is so unelectable that she can only beat nutjobs, why are you endorsing her?
With regards to the non- Huntsman Walker, Rubio Ryan and Bush Republicans... I said she was vulnerable
not that she would lose.... Besides I doubt, Rubio and Bush are running, Huntsman definitely isn't running, Ryan isn't running, and I get the feeling the GOP base prefers Cruz to Walker...
And besides, do you really think any serious Democrat (regardless of what vulnerabilities Hillary has) will actually run against her?