Re: And the nominees are...
I hope you weren't being serious. If the dems nominate Bernie Sanders it'll be the Mondale/Dukakis days all over again where they fall in a landslide to any decent republican candidate and would lose even to an extremist like Scott Walker. Eastern liberals (worse a self described socialist in Bernie's case) do not have a chance in US elections, no matter how much liberal democrats may wish they did. It is the same extremist fantasy that keeps republicans talking about people like Palin or Walker.
The only viable alternative the democrats have is Elizabeth Warren, but it is unclear if she'll even run. Since it has been fait accompli that Hillary would win the nomination easily, there's been no attention on anyone else in the democrat ranks who might have otherwise been in the news and started to make a name for himself like previous unknowns like Rubio did for the republicans.
Hillary is almost certain to win the nomination, and the democrats have no one to blame but themselves for assuming that for so long that no one else wants to even challenge her. If the religious right sends an extremist against her, she'll win despite her baggage. If the republicans have some sense and go for someone the people in the vast middle ground of voters can relate to, they'll likely beat her.