Lewis was one of the "Big Six" civil rights leaders, which included Martin Luther King Jr, and helped organise the historic 1963 March on Washington for Jobs and Freedom at which the latter delivered his historic "I Have a Dream" speech.
Warren's withdrawal came after she failed to win a single state on Super Tuesday, including her own, Massachusetts.
Clinton further said, "Nobody likes him, nobody wants to work with him, he got nothing done. He was a career politician".
Bernie Sanders, US senator of the state of Vermont, followed Biden with 21 per cent support.
"The $11 trillion in household insurance and out-of-pocket expenses projected under our current system goes right back into the pockets of America's working people," her plan states.
Senator Bernie Sanders from Vermont came in third with 14 per cent of support. Pete Buttigieg, Mayor of South Bend, Indiana, ranked fourth with support rate unchanged at 7 per cent, according to the poll.
The winner of the Democratic presidential nomination will be announced next July at the party convention. The presidential election will take place in November.
Democratic presidential candidate Senator Kamala Harris, who is of Indian and Jamaican descent, has said that she supports Congress moving towards President Donald Trump's impeachment.
The severity of this misconduct demands that elected officials in both parties set aside political considerations and do their constitutional duty.
Democrat Senator Elizabeth Warren has officially launched her 2020 presidential campaign at a rally, using the backdrop of Everett Mills – the site of a historic 1912 labour strike led by women and immigrants.
