Billionaire Tax Fight: Props 40, 41, 42

California's billionaire tax is on the ballot this fall — and almost nobody fighting over it is who you'd expect. The state's own nonpartisan analyst won't back the $100 billion revenue number the sponsors are citing. A 1979 law from the same tax revolt that gave California Prop 13 has been rewritten as a legal kill switch aimed squarely at this measure. And the single largest donor bankrolling…