California votes today on a first-in-the-nation tax that would grab 5pc of everything its 250 billionaires own

Supporters argue billionaires exploit loopholes to pay lower effective rates than their cleaners; opponents warn the ultra-rich will simply pack their bags for Texas or Florida, gutting the state's tax base.

A Los Angeles street poll found voters backing both the billionaire tax AND voter ID requirements — a crossover that confounds the usual left-right divide.

Opponents include the billionaire, who has already relocated Tesla's HQ out of California, and other tech titans warning the measure would accelerate an exodus already under way.

Labour's class warriors are watching closely, raising the prospect that a California yes vote could hand the Chancellor's Treasury a template for a UK wealth tax push.