A new analysis of campaign finance data shows that nearly 100 billionaires and their spouses have contributed to Republican Sen. Susan Collins’ reelection bid so far, funneling nearly $10 million to the incumbent’s campaign committee and PACs supporting her effort to fend off progressive challenger Graham Platner.

The Maine Monitor on Thursday published a list of billionaires who have donated to Collins and Platner, who has called his Republican opponent a “corrupt” protector and beneficiary of an oligarchic political system. The outlet noted that Collins’ billionaire donation total “stands in stark contrast with the fundraising of her opponent... whose campaign has mostly attracted smaller amounts of funds but from many more people.”

Collins’ largest billionaire donor to date came from Ken Griffin, a hedge fund manager who pumped $2.5 million into Pine Tree Results, a Super PAC supporting the five-term Republican incumbent. Collins’ network has also received at least $1 million from Blackstone CEO Stephen Schwarzman, New Balance chair James Davis, and hedge fund manager Paul Singer.

In 2017, Collins voted for legislation that delivered massive tax breaks to large corporations and American billionaires, whose collective wealth surged to $8.1 trillion last year. ProPublica reported that private equity became Collins’ “most reliable source of donations” after she withdrew an amendment to the 2017 legislation that would have targeted one of the industry’s beloved tax breaks.