Tom Perez addressed the sexual assault allegations against the former vice president during an ABC News interview Sunday.
Biden leads Trump in the battleground states of Wisconsin, Florida, Michigan, Pennsylvania and Arizona.
The former second lady said it would be "wonderful" if former first lady Michelle Obama would join the ticket but she wasn't confident Obama would take the job.
Biden has seen his lead over Trump grow significantly over the past couple weeks, according to the new survey data.
Recent polls also show Biden leading President Donald Trump by at least 5 points in hypothetical head-to-head matchups.
Several users of Twitter, where the request was made, are hoping the former U.S. president will agree to the speech.
"They didn't fight for me to be told by white people which white person I can vote on."
Trump is halting U.S. funding of WHO after previous administrations' "benign neglect" policy allowed Beijing to mislead the organization, with deadly consequences.
As the Democratic party rallies behind its least inspiring candidate, it's worth taking stock what America and the world lost out on in these primaries. One thing is certain—Biden won't solve the issues that produced the Trump presidency.
Both Obama's endorsement of Biden and Clinton included a call for unity and praise for Bernie Sanders, the Vermont senator who failed to clinch the nomination in both primary contests.
After more than a year of silence on the matter, Obama endorsed former Vice President Joe Biden for president in 2020.
Both the former vice president and the HBO host discussed the connections between climate change and the coronavirus Friday night.
"No one should be forced to choose between their right to vote and their right to stay healthy like the debacle in Wisconsin this week," Obama tweeted Friday.
Former President Barack Obama cautioned that leaders spreading misinformation during the COVID-19 pandemic is especially dangerous since people were being required to "make sacrifices and take actions that might not be their natural inclination."
Trump narrowly beat Hillary Clinton in several battleground states that Obama had won in 2008 and 2012. Democrats aim to win back these states in 2020.
The majority of Florida voters also said they disapprove of Trump's handling of the coronavirus pandemic.
The "Lean on Me" and "Ain't No Sunshine" singer died earlier this week.
On Thursday, former President Barack Obama weighed in an interview between Golden State Warriors guard Steph Curry and Dr. Anthony Fauci, director of National Institute of Allergy and Infectious Diseases and a member of the White House coronavirus task force.
D-Nice is hosting a virtual "couch party" to help the former first lady's When We All Vote organization register eligible people to vote.
The former vice president told donors that vetting of possible running mates would begin within the next few weeks.
The former president also praised medical staff and "everyone keeping our communities going" as the pandemic spreads.
"The Obama administration tested 1 million people for H1N1 in the first month after the first U.S. diagnosed case," Ronald Klain said.
The former first lady told Vogue about the difficulties women face in positions of leadership and how important it is that girls get a good education.
Civil rights activist Phillip Agnew said he took part in "misogynoirist culture" with 2009 comments about the former first lady.
Prominent U.S. politicians marked "Bloody Sunday," when peaceful protesters demanding equal voting rights for African Americans were violently beaten by authorities on March 7, 1965.
"That's right, feel the Bern!" Barack Obama says in the ad, in an audio excerpt from the former president's keynote speech at the 2016 Democratic Convention.
For viewers in early-voting or Super Tuesday states inundated with Obama-laden ads, the nuance around his invocation may be lost.
A new anti-Biden ad from the Committee to Protect the President Super PAC uses audio from Obama's book, 'Dreams From My Father' edited to sound as if it's about the former vice president.
Joe Biden replied by saying that while Obama praised the increase of life expectancy in Cuba, he never praised the Cuban government.
The former vice president drew ridicule from critics, who said the latest flub is evidence he is too out of touch to run for president.