Joe Biden’s campaign is getting a big boost thanks to his former boss. Tonight, Barack Obama is reuniting with his former Vice President for their first official campaign event together.

Campaign officials say the virtual fundraiser has already brought in more than $4 million from 120,000 people. The New York Times adds:

The joint appearance will be the biggest grass-roots fund-raiser of the cycle for the Democratic Party,serving not just as a coming-out party for the former running mates but also as something of a punctuation mark on Mr. Biden’s arrival as a financial force in his own right.

In May, for the first time, Mr. Biden and the Democratic National Committee outraised President Trump and the Republican Party, $80.8 million to $74 million, and receipts are on pace to surge even higher in June.