Krystal Ball: Warren's cynical attacks on Sanders are exactly why her campaign failed

Hill.TV host Krystal Ball said Sen. Elizabeth WarrenElizabeth WarrenIn Washington, the road almost never taken Senate poised to battle over Biden's pick of big bank critic Treasury says more rental aid is reaching tenants, preventing evictions MORE's (D-Mass.) "campaign was lost long before this election cycle."

Ball pointed to Warren's "decision not to run in 2016 - she sat out the most critical election of our lifetime even though she knew better than I did the flaws of Hillary ClintonHillary Diane Rodham ClintonDemocrats worry negative images are defining White House Heller won't say if Biden won election Whitmer trailing GOP challenger by 6 points in Michigan governor race: poll MORE." Ball then slammed Warren's decision to not endorse Sen. Bernie SandersBernie SandersIn Washington, the road almost never taken Don't let partisan politics impede Texas' economic recovery The Hill's Morning Report - Presented by Alibaba - Democrats argue price before policy amid scramble MORE (I-VT) in 2016 noting "when her supposed friend and ally Bernie Sanders, who allegedly shares her politics and was fighting for the same values she had staked her career on got into the race and started sky-rocketing in the polls challenging Hillary for the lead, rather than making the movement choice and backing the progressive, she sat it out."

Ball claims Warren's "attempts to co-opt revolutionary rhetoric in service of an establishment campaign, like Disney doing socialism, satisfied no one and left her unable to win more than 1 county and Iowa and an embarrassing distant fourth behind Klobuchar in New Hampshire."

Click on the video above to catch Ball's full remarks.