The race will be decided by about 3,300 delegates who have won the right to vote. About a third were elected at caucuses in state assembly districts in January, where longtime Democratic Party stalwarts were stunned by the number of Sanders supporters who showed up to run for, and win, delegate slots.
Another third are controlled by party leaders and elected officials, the majority of whom back Bauman.
The final third was elected through county party organizations, where both sides claim victories: Bauman won 94 percent of the vote among his hometown Los Angeles County members, who make up nearly a quarter of the total vote. Ellis has recruited new candidates in northern rural counties, where Democrats have not always been present in recent years.