Meet some of the biggest donors shaping California's U.S. Senate race

That's where independent expenditure committees come in. Sometimes called 'super PACs,' these groups can accept unlimited contributions from those who want to exert more influence on voters by funding ads that can boost or attack their preferred candidate.

Cryptocurrency billionaires and Silicon Valley leaders, such as Marc Andreessen, Ben Horowitz, and the Winklevoss twins, are among the major donors against Porter. They aim to influence candidates who back 'building the next generation of the internet.'

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