Richard Winger reporting from an event on top-two that I unfortunately had to miss because of teaching obligations:

During the question period, Paula Lee, an activist in Californians for Electoral Reform, which advocates alternate voting systems such as proportional representation, suggested an end to single-member districts. Former State Senator Steve Peace then appeared at the podium and said he now supports converting the California system to a top-three system in which Instant Runoff Voting would be used in the general election. This is a significant development, because Peace is influential and has been one of the founders of the top-two system in California.