A push to impose a wealth tax in California has set off a direct confrontation between the state's progressive electorate and the Silicon Valley billionaires working to defeat it. A wealth tax is a levy on the total value of everything someone owns, distinct from income taxes that apply only to what flows in each year. That difference is what the whole argument turns on.

The effort is framed as an attempt to tackle inequality in America's most progressive state. Supporters argue that the proposal is necessary because inequality in California has grown beyond what income taxes alone can address. Going after accumulated assets directly, they say, is the only tool that reaches the full scale of the problem.

Silicon Valley's billionaires are working to stop it. The clash amounts to a collision between populist anger and super-rich power. Both forces have real claims on what California should do. Progressive politics gives the proposal legitimacy in one of the country's most electorally active states. Money gives the opposition reach and the capacity to sustain a fight over time.

What has not been settled is which of those forces proves stronger. California's identity as America's most progressive state is the reason the proposal has political standing. The concentrated wealth of Silicon Valley's billionaire class is the reason the opposition is organized. Both facts are true at the same time, and neither one determines the outcome.

Whether Silicon Valley's richest can stop a wealth tax in a state defined by its progressive politics is now an open question. Populist anger put the proposal in motion. Super-rich power is attempting to stop it.