On April 20, Betty Yee, former California Controller, dropped out of the gubernatorial race. See this story. She did not endorse any other Democrat but said she will endorse someone soon. Her name remains on the ballot.
Also on April 20, an Evitarus Poll was released, showing: Hilton 16%, Blanco 14%, Becerra 13%, Steyer 13%, Porter 10%, Mahan 5%, Villaraigosa 2%, Yee 1%, Swalwell 1%, other 2%, undecided 20%. See here. This poll was commissioned by the California Democratic Party.