Can I add a dark horse that I think may be thrown into the mix (and is as bad or worse than the rest because she has a "clean" image and can really lead the country astray on the same level as Obuma). Elizabeth Warren. I think when the dem party finally get rid of Hillary then Warren will enter and be Sander's chief opponent. Let's face it, Joe is not a force to contend with. He will probably end up in Cleveland during the Iowa primary or at best be touting the Buckeyes while there. I think the writers of the movie Clueless just followed him around for a little while to get their inspirations for the movie.
Warren however, has not been "damaged" by Obuma, is one of the very few dems with a positive rep (which is unbelievable since she is at least as evil as any of them if not moreso) and has a base already. I think the only reason she hasn't jumped in, besides Hillary keeping a very tight leash on her, is she hasn't felt the time was right. Fortunately for us I think she miscalculated Sander's appeal and now it might be too late as Hollywood has chosen Sanders to back (no surprise there).
So I choose Syria. Why die a slow painful death when you can just get it over with.
As for Hillary, she will not get it. Bill will see to that. Would you want to go from being xPOTUS to FLOTUS (or FHOTUS, FMOTUS, FSOTUS, or whatever they come up with which could be they just leave it at FLOTUS, man wouldn't that beat all!)