Commentary Proponents of a ballot initiative to spend from $3 billion to $4.5 billion annually advancing electric cars are making a big political mistake going for a tax increase to pay for it. With California spouting annual surpluses of $45 billion-plus, they should have gone for a piece of that action. Instead, they’re floating two initiative versions and will pick the one that best resonates with the voters. One version would tack an additional 1.75 percent income tax on those making more than $2 million a year. The state’s top income tax rate of 13.3 percent already is the highest in the country of any state. The new top rate would become 15.05 percent. Supposedly it would rase from $3 billion to $4.5 billion a year. The current top federal tax rate is 37 percent. And it looks like Democrats aren’t going to be able to raise that. Add it up. …