"Porter, a University of California Irvine law professor and former state-appointed bank watchdog, is competing with three other well-funded Democrats for the chance to take on Walters.
Porter and Dave Min, another University of California Irvine law professor and former staffer to Senator Chuck Schumer, are seen as the Democratic front-runners. In June, under California’s primary rules, the top two vote-getters will move on to the general election, with Walters and one Democrat expected to make the ballot. Min has picked up the state party’s and labor unions’ endorsement, while Porter has been backed by Warren and Senator Kamala Harris of California."
From the Boston Globe, 4/21/18