Arguably the two biggest American musicians – Beyoncé, a vocal supporter of Obama, and Taylor Swift – have yet to endorse Biden this year. Swift has a massive following with younger voters that has grown as she toured at sold-out stadiums over the past year and began a relationship with Kansas City Chiefs star Travis Kelce.

Still, Biden’s Hollywood support has helped him rack up a cash advantage against Trump – albeit one the former president has started to close. DreamWorks co-founder Jeffrey Katzenberg is Biden’s campaign co-chair and has leveraged his relationships into financial support. Director Steven Spielberg is helping with messaging efforts for the Democratic National Convention in August.

Guests could purchase tickets for Saturday’s event for as little as $US250, according to Eventbrite. For as much as $US500,000, they could have a photo taken with Biden and Obama and gain access to a VIP entrance and after-party.

“The enthusiasm and commitment for Biden/Harris couldn’t be stronger,” Katzenberg said in a statement ahead of the fundraiser.

Some celebrity interactions have fallen flat and failed to generate the viral moments Biden’s campaign is seeking. De Niro’s fiery denunciation of Trump outside the Manhattan courthouse where the Republican was on trial earned plaudits from Biden supporters but was mocked by others.

Tom Hanks and Spielberg were in France alongside Biden for ceremonies marking the 80th anniversary of the D-Day landings, but did not have a public-facing role. Star Wars actor Mark Hamill made a surprise appearance at the White House in May to praise the president he jokingly dubbed “Joe-B-Wan Kenobi”. White House Press Secretary Karine Jean-Pierre later struggled to explain why he was at the executive mansion.

Biden went viral during a concert for Juneteenth, an American holiday that celebrates the end of slavery, but not in the way his campaign desired. Videos of the 81-year-old president appearing to freeze during one of the musical performances circulated on social media, raising concerns about his age.

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Trump has also made inroads with celebrities, posting his first video to TikTok this month alongside UFC chief executive Dana White. Trump has already amassed more followers and likes than Biden’s campaign account, which debuted in February. Trump in May held a rally in the Bronx, New York, and invited rappers Sheff G and Sleepy Hallow in an attempt to connect with black voters.

“The only people in America who support Joe Biden’s failing campaign are elitist Hollywood celebrities,” Trump spokeswoman Karoline Leavitt said in a statement.

Biden’s Democratic predecessors navigated the celebrity universe with greater ease. Obama routinely hosted birthday parties attended by the biggest stars in music, movies and sports. Bill Clinton’s signature moment in the 1992 campaign came when he played saxophone on the Arsenio Hall Show.

Both men have lent their help to Biden. Biden raised $US25 million at New York’s Radio City Music Hall in March at a one-day bonanza featuring the two former presidents and performances by Broadway stars. That event was interrupted by protesters angry with Biden’s handling of the Middle East conflict. Demonstrators gathered outside Saturday’s venue as well.

“We have a lot of differences in our own party and that’s healthy,” Obama said.

Polls showing Trump making gains among black voters, who were key to Biden’s 2020 victory, are increasing pressure on the president to connect with voters of colour. Earlier on Saturday, Trump courted black voters at a church in Detroit in swing-state Michigan.

Obama dismissed those efforts, joking that the one thing Trump did for black Americans was “he made them feel even better about the first black president”. He urged Democrats to turn out in November, saying “a bunch of folks for whatever reason sat out” in 2016 when Trump won the White House. “Hopefully we have learned our lesson.”

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During his 2020 campaign, Hollywood stars from Will Smith to Mindy Kaling and Ben Affleck donated to Biden, according to campaign finance data. But Biden is having trouble regaining the support of some stars. Rapper Cardi B and actor Dwayne “The Rock” Johnson backed Biden before but have indicated they will not do so again.

“Using celebrities for fundraising and using celebrities for voter engagement are two very different tactics,” Montgomery said.

Bloomberg

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