Warren Buffett invests in a Clinton presidential bid

Adam Jeffery | CNBC

Warren Buffett

The USA's second-richest man just bet on Hillary Rodham Clinton for president.

Berkshire Hathaway's Warren Buffett has donated $25,000 to Ready for Hillary, a super PAC laying the groundwork for the Democrat's potential White House bid, officials with the super PAC confirm.

The group, which raised more than $10 million through Oct. 15, will file its paperwork detailing recent contributions and expenditures by midnight Thursday.

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Buffett has made no secret of his support for Clinton, declaring earlier this fall that "Hillary is going to win." He also has contributed to her past campaigns. However, the recent donation marks the first time the billionaire investor has contributed to a super PAC that can raise or spend unlimited amounts to aid an individual candidate.

Ready for Hillary has voluntarily imposed a $25,000 limit on the donations it will accept.

Bloomberg Politics first reported the Buffett contribution.

Buffett's support — along with that of other wealthy individuals including financier George Soros and Walmart heir and philanthropist Alice Walton — underscore the big financial edge Clinton would enjoy if she entered the race.

Forbes pegs Buffett's net worth at $73.6 billion, falling behind Microsoft founder Bill Gates' $82 billion fortune.

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