For Clinton to attack Sanders as friendless and ineffective then — and to do so with the Iowa caucuses just 13 days away — affirms to Sanders backers that everything he has been running against within the Democratic Party is still out there, and still doesn‘t like him. That it is coming from Clinton, who not only represents the dynastic streak within Democratic politics that many within the grassroots reject, but who also lost what everyone assumed to be a sure thing victory over Trump in 2016, makes this all even more powerful for Sanders.