I dont understand why partisan Dems dont see the disaster that Hillary will be for their party. She might win, might have moderate coattails, but the long term damage she does to the party will be enormous. Can the Dem party in 2018 stand another 2014 or 2010 rout?
Thanks to 2010 and 2014, there is essentially no Dem bench in many states, OH and FL among them. How far down does the Dem party want to fall so that Hillary can be president?
The Republicans muckrake against any Democratic candidate. Hillary has these scandals but if Warren the Fake Cherokee or Biden the Plagiarist Groper or anyone else were the nominee, these same books would still get written with conspiracy theories surrounding everyone they've ever met. To think that simply subbing out Hillary will make it go away is rubbish.
Boring old John Kerry probably had the cleanest nose of any Democratic nominee of the past the century and he was completely trashed as a fake war hero and liar.
The conservative talk radio/Breitbart/Drudge circuits are skilled at smearing anyone. It's an effective way to rally the far right base at a grassroots level. The media--conservative, liberal, and neutral--love the idea of scandals because its good for ratings, so they tend to buy in on accusations.
The question Democrats have to ask if they want to succeed is not "who can we get that won't get tarnished in scandal?" but "who can we get that will be able to defend themselves against the attempts to tarnish them with scandal?" The best answer is Clinton.
Otherwise, you end up with John Kerry and George McGovern getting punched in the face repeatedly without much resistance.