Control of Congress is the biggest issue at stake in November’s elections. A close second might be the fight over a ballot initiative in California, Proposition 40, that seeks to impose a wealth tax on the state’s roughly 250 billionaires. If approved, it will be the world’s first billionaire tax. At a town hall in August, one of its chief proponents, Representative Ro Khanna, whose district encompasses much of Silicon Valley, asked how many in the audience were in favor of the measure. Dozens of hands quickly shot up — an overwhelming majority of those in the room. That Proposition 40 enjoyed such strong support was telling. Even here, in one of the most affluent parts of the country, anger