Sanders' 2020 campaign has not launched without baggage. He's still a flashpoint for some liberals who blame his leftist platform for taking voters away from Clinton.

He also had to address accusations from women who worked on his 2016 campaign and said they were sexually harassed or mistreated; Sanders issued an apology in January before announcing his presidential campaign in mid-February.

\"The allegations that I have heard, that you have heard, speak to unacceptable behavior that must not be tolerated in any campaign, or in any workplace in our country. To the women in our campaign who were harassed or mistreated, I apologize,\" Sanders said during a news conference on Capitol Hill. \"Our standards, our procedures, out safeguards were clearly inadequate.\"

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