"These guys don't know what they're talking about," he said of the Trump-Pence ticket.
The event commemorates the five police officers killed in a sniper attack last week.
“Damn, I wish they had that when I graduated,” he joked. “I could’ve really used it.”
The vice president delivered a sarcastic thank-you to Donald Trump.
Biden in 1992 said hearings on a nominee should be postponed.
The White House will use the site to "add a new layer of context and commentary."
Biden's inner circle has indicated his decision is imminent.
Debate host CNN had held out hope that the vice president would participate.
Donald Trump and Hillary Clinton continue to lead their parties in those three states.
A new report says the vice president is taking a fresh look at challenging Hillary Clinton.
He praised Biden for having "very good values," though.
The Bidens were not in their residence when the shots were fired.
The former president danced during "Battle Hymn of the Republic" at the memorial event.
The speech is likely to be one of Biden's most targeted against Trump this year.
The support could provide momentum for Joe Biden's push.
“I would not vote for Trump, clearly."
The Obamas will visit the court Friday but skip Saturday's funeral.
Chris Coons had been a vocal supporter of Joe Biden jumping into the race.
Winners: Clinton and Obama; Sanders and Biden get mixed reviews.
The ad features the vice president talking about fighting for the middle class.
Biden also has substantial leads against top GOP candidates.
The White House has launched a major lobbying push to win support for Iran nuclear deal.
His office said he will be traveling abroad on March 3.
Coons said Biden was being thoughtful during swearing-in ceremony.