Appearing together in San Francisco on Monday, they pointed out that Republicans are making a strong push to regain Congress in this election. What's needed, Obama said, is to recapture the Democratic enthusiasm of the 2008 election.
Biden urged attendees to extend their efforts to get out the vote.
Nearly 700 attended the fundraiser, hosted by the Democratic Congressional Campaign Committee and expected to raise about $1.6 million.
Pelosi spoke briefly to praise Biden and Obama, but remained largely out of sight. Some observers say that that's an indication that Republicans have successfully painted Pelosi as the enemy, and that now Democrats worry about potential damage done by associating with her.
California's races are particularly tight this year. Other high-profile politicians have visited as well, with recent fundraisers and rallies hosted by Bill Clinton and Barack Obama.
Dianne Feinstein admitted that the climate is rough, describing the current situation in one word: "bad."