Hi O'Tink,
What I can tell you for certain is that I scuttled her...and it happened when the DNC pulled those shenanigans to remove Bernie Sanders out of her way. I knew I could not vote for Trump, but neither could I vote for Clinton.
I don't know a lot about politics, so if you can comment on this please do...but going deeper in links from your WaPost website, apparently the Democrats are in deeper political trouble than ever; Republicans dominate not only the Congress but also the governorships, the State legislatures. TheAtlantic.com has an opinion piece saying that with Trump, the Republican Party may be on a major turning point also - like something never seen since Goldwater in 1964. Goldwater lost badly, but his philosophy changed his party.
Here is one more guess, which would appreciate your (or anyone's) opinion; I have read the Democratic Party has sold out to big business conservative interests-as-usual, they are just a little bit slower about it than the Republicans. In other words, not much difference now between parties. No one is speaking now for the working class.
Well, not sure I answered your Q - so I will say yes, prolly Shumer is disavowing (if not scuttling) Clinton.