Just my opinion of course, but the dems don't have a viable candidate, nor do they want one. I do agree with Ken King's assessment that it's Hillary's for the taking, but only if she wants it, fear might have her in a death grip.
Why? Because the dems hate Trump. Not for anything Trump has done, other than what he did to Hillary. Trump dealt Hillary the most embarrassing blow she has ever had to endure. Bill's escapades were nothing compared to what Trump did to her, that was all Bill's fault because he was a typical worthless male. Trump proved America just plain hates her, and that's a jagged pill she can't swallow.
Sure, the resident Trump haters here will tell you they all dislike Hillary too, but who do you think they voted for in 2016? They have to hate Trump, for Hillary!
So if Trump is in office four more years, that's fine with the dems. It's another four years of delicious hate. Just like Buffalo Bill in Silence of the Lambs, "They got a real taste for it now".