Speaking at a drive-in rally in Philadelphia on behalf of Biden, his former vice president, and Democratic running mate Kamala Harris, Obama put forward his fiercest critique yet of his successor. He took aim at Trump's divisive rhetoric, his track record in the Oval Office and his habit of re-tweeting conspiracy theories.
"With Joe and Kamala at the helm, you’re not going to have to think about the crazy things they said every day," Obama said. "And that’s worth a lot. You’re not going to have to argue about them every day. It just won’t be so exhausting.”
Obama, who governed for two terms and remains one of the most popular figures in the Democratic Party, blasted Trump for his handling of the coronavirus pandemic, noting that the president himself had fallen victim to the virus.
"Donald Trump isn't suddenly going to protect all of us," he said. "He can't even take the basic steps to protect himself."
"This is not a reality show. This is reality," Obama referred to Trump's past as a reality TV host. "And the rest of us have had to live with the consequences of him proving himself incapable of taking the job seriously.”
The drive-in rally was held in the parking lot of Citizens Bank Park, the baseball stadium in Philadelphia. With nearly 280 vehicles spread throughout the lot, it was the largest event of its kind that the Biden campaign has staged during the pandemic.
"We've got to turn out like never before," Obama warned Democrats against complacency. "We cannot leave any doubt in this election."
With more than 42 million ballots cast both via mail and in person, Americans are voting early at a record pace this year ahead of Nov. 3 Election Day due to concerns about the coronavirus and in order to ensure their votes are counted.
The early vote so far represents about 30% of the total ballots cast in 2016, according to the University of Florida's U.S. Elections Project.
Four years ago, Obama participated in a rally in Philadelphia with then-Democratic nominee Hillary Clinton the day before the election, only to see Trump take the state. The Biden campaign considers winning there a top priority.
In remarks at an evening rally in Gastonia, North Carolina, Trump briefly mentioned Obama, noting that he had supported Clinton in her losing effort. "It was nobody who campaigned harder for Crooked Hillary than Obama, right?"
Even though Wednesday marked Obama's 2020 campaign debut, his support has been essential for Biden. He has appeared at joint fundraisers with Biden and Harris, and his network of well-connected former aides has been instrumental in helping the campaign outpace Trump in bringing in donations.