He has consistently held a significant lead in public opinion polls since he entered the race in April.
Other candidates also reported a fundraising boost from the debates.
In Chicago on Friday, Biden rolled out a series of proposed reforms.
At the start of the debate, US Rep. Eric Swalwell of California reminded Biden of a speech he gave as a presidential candidate many years ago, when he said it was time to pass the torch. Kamala Harris, D-Calif., speaks during the Democratic primary debate hosted by NBC News at the Adrienne Arsht Center for the Performing Art, Thursday, June 27, 2019, in Miami. One such question was on whether the candidates would decriminalize immigrants who crossed the USA border, and the moderator José Díaz-Balart was forced to ask the question not once, not twice, but three times before getting an answer from Biden.
Biden sought to defend his record, saying he was only against "busing ordered by the Department of Education" but didn't oppose local integration efforts, and tried to put his comments about former Senate colleagues in context.
She said Mr Biden's experience working alongside Mr Obama is a big reason she may support him in 2020: "I love that". "This man had a backbone like a ramrod". "The one thing I agree on is we can make massive cuts in the $1.6 trillion in tax loopholes out there, and I would be going about eliminating Donald Trump's tax cuts for the wealthy".
Speaking to reporters outside the U.S. Capitol in Washington on Friday, Harris said, "I think we covered a lot of issues, and I'm looking forward to the next (debate)".
- "Expression of hope" - The daughter of immigrants - her father is from Jamaica - Harris grew up in the 1960s in the progressive hotbed of Oakland, California, proud of the struggle her parents waged for civil rights.
Sanders hits back at AOC after Ivanka Trump dig
Following the release of the video, many were quick to criticise the First Daughter with Democrat congresswoman Alexandria Ocasio-Cortez.
OPEC curbs slash Saudi growth by more than half
But prices could stall as a slowing global economy squeezes demand and US oil floods the market, a Reuters poll of analysts found. It comes as the price of oil has risen due to increased tensions between Iran and the US.
Bucks Agree To 2-Year Deal With Robin Lopez
Per Chris Haynes of Yahoo Sports , Robin will be joining his brother Brook Lopez and form a formidable duo in Milwaukee. Perhaps his greatest value was as a 3-point shooter, where he connected on 36.5% and sank a career-best 187 3-pointers.
But Harris, too, was doing some cleanup.
Even if he continues to stumble, Biden isn't likely to bleed support quickly enough to free up some of his voters and media attention for another, more pragmatic alternative. She said she's undecided about who to enhance in 2020, however Biden is amongst the head of her picks, along with Sens.
"But I also believe - and it's personal - it was hurtful to hear you talk about the reputations of two United States senators who built their reputations and career on the segregation of race in this country". "I did not praise racists". The current Real Clear Politics average shows her with seven percent support, behind Biden and Sens.
Speaking to the Reverend Jesse Jackson's Rainbow Push Coalition, the white former vice president was working to fix the damage from a blistering attack from California Senator Kamala Harris, the lone black woman in the 2020 presidential race.
"The American people understand that Trump is a phony, that Trump is a pathological liar and a racist and that he lied to the American people during his campaign", said Sanders, who was relegated to the sidelines for much of the night.
This was far from the only moment in which a candidate called out Biden during the debate. He pointed to what he known as repeated missteps, along with Biden's feedback on segregationists and the dilapidated US vice-president's most up-to-date reversal on the Hyde Amendment, a protracted-standing congressional ban on using federal successfully being care money to pay for abortions.
The arguments pivoted over the role of government in healthcare and other issues - and whether the party should embrace aspects of democratic socialism, a position repeatedly pushed by Sanders, who was standing at Biden's left.