In an election, numbers matter.
But what happens when you're not even allowed to vote for those who rule you?
California regulators have acquired de facto control over the cars you're allowed to buy – even if you don't live in California – by decreeing their own California-specific mileage and emissions standards. These end up having the force of national standards because the car industry – which wants to sell cars in California – can't afford to build cars for just California and then another set of cars for the rest of the country.
So they build all their cars to meet California's standards – which are even more corseting then federal (national) standards.
The cost of complying with them amounts to a "California Tax" levied on everyone – including those who don't live in California.