From San Fancisco: Vermont Senator Bernie Sanders attended a rally to discuss his support for Proposition 40. The event, called "Ballots Over Billionaires," focused on a wealth tax. Proposition 40 is set to appear on the ballot in November.

If passed, it would impose a one-time wealth tax on billionaires in California. Senator Sanders was present to talk with voters about the proposition.

Further details about the proposition and the rally are available from the source, including more information about the proposed wealth tax and its potential impact.