Starting in the fall, the donation will cover full tuition for medical students from families earning less than $300,000.
Elizabeth Warren was a leading aggressor early against Bloomberg. She called him "a billionaire who calls people fat broads and horse-faced lesbians."
"What we need to know is exactly what's lurking out there," Warren said.
Former New York City Mayor Michael Bloomberg received 19% in the NPR/PBS NewsHour/Marist poll. He needed 10% to qualify.
Nearly two weeks from the California primary, Minnesota Sen. Amy Klobuchar made a fundraising stop in Beverly Hills Monday night.
Democratic candidate Mike Bloomberg skipped the Iowa caucus and is focusing on delegate-rich states like California to aim for a big win on Super Tuesday.