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.
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.
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.
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.
The president said that bringing Americans home was the "right thing to do" and that the two situations were like "day and night."
"I wrote a great backhanded endorsement of Obama," Democratic presidential nominee Michael Bloomberg said in a leaked recording of one of his 2016 speeches at a private event. Bloomberg also declared he would "defend the banks" if he were president.
He also suggested that billionaire Michael Bloomberg "spend millions in South Carolina" to defeat the Vermont senator.
Sanders told CNN that he believed the former president would play a "vigorous" role in the 2020 campaign.
President Trump touted the robust U.S. economy at a Keep America Great rally in Colorado Springs on Thursday night.
At the Keep America Great rally in Phoenix, Arizona, President Trump also touted the economy, jobs, and new trade deals.
"Barack Obama himself said you need a magic wand to bring half a million manufacturing jobs back," said Trump's trade adviser. "And guess what? President Trump was the magic wand."
"John Bolton, in his own words, is revealing that the emperor has no clothes," said the former Obama deputy national security adviser.
The president attacked his predecessor on Twitter after the latter took credit "for more than a decade of economic growth and the longest streak of job creation in American history."
Obama made the remarks at the NBA All-Star Weekend Newsmaker Brunch on Saturday.
The Department of Justice is allegedly seeking proof that intelligence agencies during the Obama administration were purposely deceptive about information concerning Russian meddling in the 2016 election.
"You'd still rather be Bernie Sanders than anybody else," said former Obama campaign manager David Plouffe.
Sergei Lavrov accused Obama of putting personal issues before those of the state and undermining ties between Washington and Moscow.