Jonathan Henes, a 50-year-old Kirkland & Ellis restructuring partner, knew he wanted President Donald Trump out of the White House, but he didn't know in January which Democrat to support. His son Sam nudged him along.

"Sam came into my room," Henes recalls, "and said: 'I wrote an article about how my first vote ever would be for Kamala Harris.'"

Soon after, Henes contacted Harris's campaign, telling staff that both he and his son wanted to get involved. It wasn't long before Henes had maxed out his individual contribution to Harris and hosted several fundraisers for the California senator.