Vice President Joe BidenJoseph (Joe) Robinette BidenElizabeth Warren can unify Democrats and take back the White House Giuliani doubles down on Biden comments: 'I meant that he’s dumb' Meghan McCain shreds Giuliani for calling Biden a 'mentally deficient idiot' MORE on Friday night fought for a consistent champion of the Obama administration agenda facing a tough re-election battle.

Speaking at a rally for Sen. Barbara BoxerBarbara Levy BoxerThe ‘bang for the buck’ theory fueling Trump’s infrastructure plan Kamala Harris endorses Gavin Newsom for California governor Dems face hard choice for State of the Union response MORE (D-Calif.), the Biden event tickets went for $1,500 each or $2,500 for couples, as well as a lesser round of fundraising attendees such as $500 for younger Democratic operatives. Biden also helped staff a fundraiser for Boxer in Acton on Thursday, as part of Biden's second trip to the West Coast in Boxer's election cycle, including actors Danny DeVito and Rhea Perlman.

The private fundraiser Friday evening was held on the back lawn of a Bel Air home, framed by palm trees and accompanied by a jazz band and with guests treated to a dessert bar.

Biden spoke for 14 minutes, according to a pool report, describing himself as one of Southern California's "best friends in politics," and noting their collaboration on a bill to prevent domestic violence when Biden was in the House and Senate.

Biden said tightening polls for Boxer's race show that "You always give us a heart attack every single time you run; well, why should this be any different? Just get ready."

Boxer reprised a stump speech, calling California "the clearest choice in the nation,” promising to fight for jobs and criticizing Fiorina’s record at Hewlett Packard.

"Before Carly Fiorina was fired as the CEO of Hewlett Packard, she laid off 30,000 workers—now there are some cities in California that are far smaller than that—she laid off 30,000 American workers, mostly Californians, sent jobs to China and during that period of time she made a fortune for herself,” Boxer said. “When she is asked about this, her response is: ‘I did what any family would do in tough times.’ "

Boxer noted that under Fiorina, HP stock price dove by more than 50 percent.

"And that’s why I take the time to mention these things,” Boxer continued. “And for the life of me I don’t understand how that qualifies you for the United States Senate when you were fired.”

Biden spoke for 32 minutes overall, with only a few brief references to Boxer but telling the candidate, "You're going to win this." The vice president said President Barack ObamaBarack Hussein ObamaFeehery: Betting on Trump Pew study finds Americans can’t tell fact from opinion Should President Trump, like President Obama, forsake human rights in pursuit of the deal with a tyrant? MORE needed help in the Senate.

“We knew we needed allies," Biden said. "We knew we needed people with some steel in their spine. ... In moments of great crisis, people know they need change, but they fear it even more.  There’s such a sense of uncertainty. We knew we had to have people that would put their self interest behind the national interest. And that’s why we knew – not a joke – we had to turn to Barbara in the Senate.”