Sen.
Bernie Sanders' 2020 campaign is on the upswing.
In fact he's so popular he has a target on his back.
He's been at the top of recent polls in important early voting states.
He dominated in fundraising and nabbing endorsements from prominent progressive groups.
Business Insider says Sanders is getting roasted for telling Elizabeth Warren than a woman can't win the presidency.
He also called Warren a liar during the CNN debate.