A billionaire tax has caused division within a party. Some Democrats have broken with their party over the issue. This split is related to Prop 40, which has deeply divided the left.

Further information about the division and Prop 40 is available from the source. The source provides more details about the situation and how it has affected the party.

The source of this information is Fortune, which has reported on the division within the party and the impact of Prop 40.