Returns like this don't come twice.
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Google co-founder Sergey Brin has given another $20 million to the campaign against California's Proposition 40, taking his total spending past $100 million. Prop 40, on the November ballot, is a one-time 5% tax on the net worth of roughly 200 California billionaires, with proceeds largely funding state healthcare programs; Brin's own bill is estimated at $13.3 billion against a net worth of about $267 billion. Nvidia CEO Jensen Huang, who would owe about $8 billion, has said he is 'perfectly fine' paying it, while Governor Gavin Newsom opposes the measure and calls instead for a national billionaires' tax.