"I think the current occupant of the White House is an embarrassment to our country".
While many of his supporters are sticking with him, some are waiting to see how the Democratic field seeking to challenge Republican President Donald Trump shapes up.
Sen. Kamala Harris of California, another Democratic presidential contender, was in New Hampshire on Monday and said she'd compete for the state. If voters fear any of that happening, it could (particularly with some encouragement from the kind of intensely hostile conservative media that Sanders and Biden were spared in 2016) affect their electability in ways that are not easy to anticipate in scope and power. The explanation fell flat and, days later another report emerged accusing an operative on the campaign of forcibly kissing a younger female staffer.
Sanders ran in the 2016 Democratic primary against former Secretary of State HIllary Clinton.
This time around, the senator will attempt to prove he can be more than a foil to an establishment-backed frontrunner, running against a deep and diverse field of rivals who have excited a new generation of Democratic voters.
"Together, you and I and our 2016 campaign began the political revolution. I also think he is a racist, a sexist, a homophobe, a xenophobe, somebody who is gaining cheap political points by trying to pick on minorities, often undocumented immigrants", Sanders said. It now embraces many once-fringe policy positions the senator help popularize, like instituting a $15 federal minimum wage or implementing a national single-payer healthcare system.
"It is absurd that the taxpayers of this country have to subsidize the wealthiest person on Earth, who happens to be Mr. Bezos, because so many of his workers made wages that were so low that they were forced to go on food stamps and Medicaid", Sanders told CNN. "My views are maybe a little bit different".
Mr Sanders galvanised a broad coalition with his anti-Wall Street rhetoric and talk of a "political revolution".
Sanders announced his 2020 presidential bid earlier Tuesday. "The margin by which we lost the African-American vote has got to be - at the very least - cut in half or there simply is no path to victory", the team wrote in the memo, which was reviewed by The New York Times.
"We're gonna win", Sanders told CBS in interview to be broadcast Tuesday morning.
But running in 2020, Sanders could be a victim of his own success.
Prior to his tenure in Congress, Sanders served as mayor of Burlington, Vermont for three terms.
At one point during the interview, Kinzel asked Sanders whether he represents "the face of the new Democratic Party". Other staffers from Sanders' first bid also have said they would consider working for other candidates in 2020. By the summer of 2015, he was regularly speaking to crowds numbering in the thousands or tens of thousands.
The 77-year-old gained a strong following with plans to make college tuition free and for the government to greatly expand its role in providing health care to Americans. After several speeches were disrupted by protesters, he began speaking more about criminal justice reform and an end to the war on drugs.
They are to oppose President Donald Trump, Sanders said, and to enact numerous ideas that he had championed in 2016, including universal healthcare and $15 minimum wage.
As Senator Sanders's last campaign surged, neither candidate was comfortable making personal attacks.
In the end the race ended up being far tighter than predicted, with Sanders winning several states - including the likes of MI - which Clinton later lost to Trump. When all was said and done, he had won more than 1,800 delegates.
Senator Sanders campaigned for Hillary Clinton. "And together we can defeat Donald Trump and fix the damage he has done to our country".
Mrs Clinton's surprise defeat left Democrats leaderless. She also appeared to take a dig at Sanders.
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