Expenditures by independent groups seeking to influence California's gubernatorial election broke records this cycle, according to the state's Fair Political Practices Commission.
As of Oct. 11, a total of $20 million had been spent by more than 30 groups in support of Democrat Jerry Brown.
Republican Meg Whitman, meanwhile, saw only two groups spend a total of $1.3 million in her support.
The three top independent contributors to Brown's campaign are the union-backed California Working Families for Jerry Brown, Concerned Educators for Jerry Brown, and Working Californians to Support Jerry Brown.
The last independent-expenditure record was set in 2006 when groups spent a total of $20 million on the race between Republican Arnold Schwarzenegger and Democrat Phil Angelides.
The state also holds the country's personal spending record because of this election — Whitman has spent a total of $119 million on the race, beating New York City Mayor Michael Bloomberg, who spent $109 million on his 2009 reelection campaign.