"We began the political revolution in the 2016 campaign, and now it's time to move that revolution forward", he said. Sanders added: "We are running against a president who is a pathological liar, a fraud, a racist, a sexist, a xenophobe and someone who is undermining American democracy as he leads us in an authoritarian direction".
"You know as well as I do that we are living in a pivotal and unsafe moment in American history", says Sanders, about 4 minutes into his announcement. "Bernie opened the door for progressive politics, but I think he has to recognize there are new voices and a new bench".
Sanders has announced that he plans to run in the 2020 presidential race. Bernie Sanders, I-Vt., speaks about his new book, "Where We Go From Here: Two Years in the Resistance", at a George Washington University/Politics and Prose event in Washington.
He garnered passionate support among young liberals with his calls for universal health care, a US$15 minimum wage and free public university education.
"Our campaign is about transforming our country and creating a government based on the principles of economic, social, racial and environmental justice".
Sanders, who enthusiastically embraces proposals ranging from Medicare for All to free college tuition, stunned the Democrat establishment in 2016 with his spirited challenge to Clinton. Kamala Harris (D-CA), Cory Booker (D-NY), Kirsten Gillibrand (D-NY), Amy Klobuchar (D-MN), and Obama-era HUD Secretary Julian Castro. "We're going to win", Sanders tells John Dickerson about what's different this time around, but it's far more likely that Sanders will get lost in the background, the same way he did for most of his political career before 2015.
There is also the question of whether influential progressives like New York Rep. Alexandria Ocasio-Cortez, who volunteered on Sanders' 2016 campaign, and traveled with him during the midterms to campaign for progressive hopefuls, will offer their public support.
Shortly after Senator Bernie Sanders suffered a crushing loss in South Carolina's Democratic primary in 2016, his campaign's African-American outreach team sent a memo to top campaign leaders with an urgent warning.
Originally seen as an outsider for the Democratic candidate nomination, he ended up capturing 23 state nominating contests.
Sanders last week told WCAX he is proud that some of his core issues, which were considered radical by mainstream Democrats, have been adopted by many in the party.
Sanders also had strong words for President Donald Trump, who is set to run for re-election in 2020.
Donald Trump himself has expressed his admiration for Sanders, saying he would have preferred to run against him than Hillary in 2016.
Sanders was a former mayor of Burlington in Vermont.
Some #MeToo movement activists have also come out against a Sanders candidacy after several employees on his 2016 campaign complained of sexual harassment by staffers.
Debbie Wasserman-Schultz was also forced to resign as head of the DNC after leaked emails showed her conspiring with the Clinton campaign to sabotage Sanders.