Sanders lost all three states holding primaries on Tuesday and hasn't won any contests since Super Tuesday in early March, with the exception of North Dakota and the Northern Mariana Islands.
He now has 971 pledged delegates to 737 for his main opponent, Bernie Sanders, according to Edison Research, while the latter said he was assessing his campaign's prospects.
Ms Gabbard said: "I'm suspending my presidential campaign and offering my full support to [former] vice president Joe Biden in his quest to bring our country together".
Much of it has been people contrasting Biden in the past few days with actions and proposals from Senator Bernie Sanders, including from the Sanders camp.
On Tuesday, Democratic primary voters sided with Biden over rival presidential candidate Sen.
The largest prizes remaining in the primary race include the states of New York, Pennsylvania, and New Jersey ahead of the party's convention in Milwaukee, Wisconsin in July.
The congresswoman garnered headlines and a fundraising boost in October when former Democratic nominee Hillary Clinton said Russian Federation might support Gabbard in a third-party presidential bid.
Molinari withdraws from Bay Hill with back injury
After finishing tied for third a year ago , the Englishman is back for another shot at the win in 2020. Graeme McDowell is 4 under par and Padraig Harrington is 2 over.
While challengers to presidents always play a reactionary role, that is especially true for Mr Biden, who has built his entire campaign as a juxtaposition with Mr Trump.
Gabbard, 38, was never a serious factor in the nomination battle. It is once again time, as Americans and as neighbors in this global community, that we stand together, and work hand in hand to defeat this new enemy - the coronavirus. He said Ms. Gabbard "has put her life on the line in service of this country and continues to serve with honor today".
"I have such a great appreciation for Sen".
"Although I may not agree with the vice president on every issue, I know that he has a good heart and he's motivated by his love for our country and the American people", she added.
Gabbard announced in October 2019 that she would not seek reelection to the House. She had yet to be present on the debate stage in 2020.
Thank you for standing with me.
"Actually, I've been focused on this crisis.I think Bernie needs space to decide what he wants to do next, and he should be given space to do that", said Warren. Yeah, she's a Russian asset, I mean totally. Kamala D. Harris of California in one debate for Ms. Harris's record on marijuana-related prosecutions as California attorney general, and also mixed it up with former South Bend, Indiana, Mayor Pete Buttigieg and Rep. Tim Ryan of OH in other notable exchanges.