A Los Angeles fundraiser headlined by Barack Obama raised more than $4 million for Kamala Harris’ presidential campaign, sources said. The Friday evening event, at the home of James Costos and Michael Smith,

The former president is taking an increasingly visible role on the campaign trail for his longtime friend: “I’m pushing, and I hope you are, too,” he tells donors.

Obama and Clinton are expected to hold separate fundraisers for Harris in Los Angeles next Friday, according to three people familiar with their plans.