I think the Democrats are tired of the Clintons.
That's my gut feeling too. The DNC and powers that be in that organization have tried everything to tell them, HRC especially, to stand down. They had their chance and it's time to move on but she is such a narcissist that she won't do it. She has to be in the lime light with cameras on her and mics recording what she says all the time to prove she still matters but she doesn't.
In fact; I believe the dem party is so sick and tired of her antics that they are doing everything they can to embarrass her into retirement. If she doesn't take the hint soon; they may leak info to the AG's office of some criminal wrongdoing that will guarantee she shuts up because she will be under a judges order to do so then looking at time after that. At that point, if she's still alive, her health will fail (it has been for some time anyway) and she will get some kind of dispensation to be imprisoned in her house with a leg monitor or something.
Or she could just shut up now and avoid all that nonsense.