I began to think I read a ten year old article.

First, I HIGHLY doubt Lawrence O'Donnell would express the view you say he did NOW-though he may have at one time IN THE PAST, namely "As a former party insider, O’Donnell states that the only way to pull the Democratic Party left is to abstain from voting for them."

Jill Stein- in 2012 she got 21000 votes in Michigan and in 2016 51000. She didn't magically become MORE attractive as a candidate- she's a useless ineffectual campaigner throwing her hat in the spoiler ring. She absolutely cost votes to Clinton.