Celebrities are increasingly lending their star power to President Joe Biden, hoping to energize their fans to vote for him in November and entice donors to pony up for his campaign.

President Joe Biden is back on the campaign trail, leading the kind of rally that was impossible last year because of the pandemic.

Biden will sign the bill into law on Friday, but the White House didn’t wait, turning the bill signing into a three-day event. Biden on Wednesday announced that his administration is aiming to secure an additional 100 million doses of the single-shot vaccine developed by Johnson & Johnson. He appeared at an event with executives from Johnson & Johnson and Merck, rival companies both producing doses of the new vaccine. The Obama White House secured its passage, but then the Democratic Party took a big hit in the midterm elections. “You’ve got to create an echo chamber and amplify it,” said Adrienne Elrod, a Democratic strategist close to the White House.

The four-time Grammy winner isn't the only Biden playlist mainstay helping his campaign against President Donald Trump. Still, Biden has gone beyond celebrities in search of campaign surrogates. Stars generate candidate buzz, help with fundraising and can build campaign event crowds even for those online. His reelection campaign has been holding its own online events with top supporters nearly every night for months and says its online events average 2.6 million views per broadcast, though its headliners are often the presidents children. The Trump campaign has also seized on Biden's preferred venue for participating in online events, a basement studio in his Delaware home accusing the former vice president of hiding from voters.